Aug
12
Dicyclomine - Digoxin - Diltiazem
August 12, 2009 | Leave a Comment
Generic Name
Dicyclomine (dih-SYE-kloe-meen) 10j
Brand Names
Bemote Dilomine
Bentyl Di-Spaz
Bycloft),e Or-Tyl Dibent
Type of Drug
Antispasmodic and anticholinergic.
Prescribed For
Irritable bowel, spastic colon, and similar digestive problems; also prescribed for colic in children over age 6 months.
General Information
Dicyclomine hydrochloride has been used for many years to calm “nervous stomach.” It and other anticholinergics work by blocking the effects of the neurohormone acetylcholine in the gastrointestinal (GI) tract. This reduces the mobility of the GI tract and slows the production of enzymes and other secretions.
Cautions and Warnings
Do not take dicyclomine if you are allergic or sensitive to any of its ingredients.
Dicyclomine should not be used by those with obstructive disease of the GI or urinary tract, severe ulcerative colitis, reflux esophagitis, acute bleeding with unstable heart function, myasthenia gravis, or glaucoma.
Dicyclomine should not be used in infants less than age 6 months or by breastfeeding mothers.
This drug should be used with caution if you have heart disease, Down’s syndrome, spastic paralysis, reduced mobility of the stomach and lower esophagus, fever, urinary difficulties, enlarged prostate, hiatal hernia, intestinal paralysis, kidney or liver disease, rapid heartbeat, hyperthyroidism (overactive thyroid gland), high blood pressure, or ulcerative colitis.
Dicyclomine reduces your ability to sweat and may lead to heat exhaustion and heatstroke, which can be life-threatening. Avoid extended heavy exercise and limit your exposure to high temperatures.
Anticholinergenic psychosis has been reported by those taking anticholinergenics, but it usually resolves within 24 hours after discontinuation of the drug.
Possible Side EfferkS
♦ Common: dry mouth, dizziness, blurred vision, nausea, and lightheadedness.
V Less common: drowsiness, weakness, nervousness, constipation, and decreased sweating.
Possible Side Effects (continued)
♦ Rare: drug allergy (symptoms include rash, itching, lives,
and breathing difficulties), confusion, eye pain, dizziness
when rising quickly from a sitting or lying position, a bloated
feeling, difficult or painful urination, headache, memory
loss, and vomiting. Contact your doctor if you experience
any side effect not listed above.
Drug Interactions
• Antacids containing calcium or magnesium, citrates, sodium bicarbonate, and carbonic anhydrase inhibitor drugs may increase dicyclomine’s therapeutic effect and side effects.
• Combining dicyclomine with other anticholinergic drugs including atropine, belladonna, clidinium, glycopyrrolate, hyoscyamine, isopropamide, propantheline, and scopolamine may intensify side effects.
• Dicyclomine may reduce stomach acidity and blood levels of oral ketoconazole (an antifungal).
• Dicyclomine may decrease the therapeutic effects of anti-glaucoma medications. Taking dicyclomine with corticosteroids used to treat glaucoma may be hazardous.
• Dicyclomine may counteract the effect of metoclopramide in reducing nausea and vomiting.
• Taking dicyclomine with a narcotic pain reliever may cause severe constipation.
• Taking this or any drug that slows the movement of stomach and intestinal muscles with a potassium chloride supplement –especially one in wax-matrix tablet form—may lead to excessive irritation of the stomach.
• Combining dicyclomine with amantadine, certain drugs to control heart rhythm, antihistamines, nitrates or nitrites, may increase dicyclomine side effects.
• Dicyclomine may increase the effects of atenolol and digoxin.
• Pftn0hiazine drugs, monoamine oxidase inhibitor antidepressants, benzodiazepines, and tricyclic antidepressants may increase side effects of dicyclomine. The effectiveness of phenothiazines to control psychotic symptoms may be decreased.
Food Interactions
Take dicyclomine on an empty stomach, a half hour before or 2 hours after a meal.
Usual Dose
Adult: 80-160 mg a day in 4 divided doses. Seniors should receive the lowest possible dosage and increase only as needed. Child (age 2 and over): 5-10 mg 3-4 times a day.
Child (age 6 months-2 years): 5-10 mg of syrup 3-4 times a day. Child (under 6 months): not recommended.
Overdosage
Symptoms include blurred vision; clumsiness; confusion; breathing difficulties; dizziness; drowsiness; dry mouth, nose, or throat; rapid heartbeat; fever; hallucinations; weakness; slurred speech; excitement, restlessness, or irritability; warmth; and dry or flushed skin. Take the victim to a hospital emergency room at once. ALWAYS bring the prescription bottle or container.
Special Information
Children taking dicyclomine may be more likely to develop high body temperature in hot weather and other side effects and should be carefully watched for side effects. Dicyclomine should not be given to infants or children unless the doctor decides that its use is absolutely necessary.
Call your doctor if you develop diarrhea, rash, flushing, eye pain, dry mouth, urinary difficulties, constipation, increased sensitivity to light, or any bothersome or persistent side effect.
Brush and floss your teeth regularly while taking this drug. Because dicyclomine may cause dry mouth, you may be more likely to develop cavities or other dental problems. Ice or hard candy may relieve dry mouth.
Constipation may be treated by using a laxative.
Dicyclomine may make you drowsy or tired and cause blurred vision. Be careful when driving or doing any task that requires concentration.
If you forget take it as soon as you remember. If it is almost time for your next dose, skip the dose you forgot and continue with your regular schedule. Do not take a double dose.
Special Populations
Pregnancy/Breast-feeding: A few cases of human malformation were linked to dicyclomine, but studies have shown that the drug has no effect on the fetus. When this drug is considered crucial by your doctor, its potential benefits must be carefully weighed against its risks.
Dicyclomine can reduce the amount of milk produced. Infants given dicyclomine may faint, go limp, and develop breathing problems and seizures. Nursing mothers who must take this drug should use infant formula.
Seniors: Seniors may be more susceptible to side effects, especially memory loss, changes in mental state, and glaucoma. Seniors may obtain maximum benefit with smaller dosages.
Generic Name
Digoxin (dih-JOX-in) A
Brand Names Digitek
Lanoxicaps
Lanoxin
Type of Drug Cardiac glycoside.
Prescribed For
Congestive heart failure (CHF) and other heart conditions involving a very rapid heartbeat.
General Information
Digoxin works directly on heart muscle. It improves the heart’s pumping ability or helps to control its beating rhythm. People with heart failure often develop swelling of the lower legs, feet, and ankles; digoxin improves these symptoms by improving blood cir-
Digoxin is generally used as part of the lifelong treatment of CHF.
Cautions and Warnings
Do not use digoxin if you are allergic or sensitive to it. Digoxin allergies are rare.
Digoxin should not be used in people with ventricular fibril-
lation.
Digoxin should be used with caution in people with sick sinus
syndrome or incomplete AV block, as it may cause a worsening of these conditions.
Digoxin has been used to treat obesity. The risk of fatal heart rhythms associated with such treatment makes it extremely dangerous as weight-loss medication. Many heart disease symptoms may be associated with digoxin. Report any unusual side effects to your doctor at once.
Kidney disease may increase blood levels of digoxin. Your dosage may need adjustment.
Long-term use of digoxin may cause the body to lose potassium, especially since it is generally used in combination with diuretics (agents that increase urination). For this reason, be sure to eat a balanced diet and high-potassium foods—bananas, citrus fruits, melons, and tomatoes.
Digoxin should be used with caution in people with electrolyte disorders.
Digoxin requirements vary with thyroid status. If you are taking digoxin and your thyroid status changes, your doctor will have to alter your digoxin dosage.
Possible Side Effects
Adult and Senior
♦ Common: dizziness, headache, nausea, and diarrhea.
✓ Less common: appetite loss, vomiting, weakness, apathy, drowsiness, blurred or yellow-tinted vision, seeing halos around bright lights, depression, psychoses, confusion or disorientation, restlessness, hallucinations, delirium, seizure, nerve pain, abnormal heart rhythms, and slow pulse.
✓ Rare: Enlargement of the breasts has been reported after long-term use of digoxin. Contact your doctor if you experience any side effect not listed above.
Child
T Children are more likely to develop abnormal heart rhythms before they see yellow or green halos or spots and before they develop nausea, vomiting, diarrhea, or stomach pain. Any abnormal heart rhythms that develop while a child is taking digoxin should be assumed to be a side effect.
Drug Interactions
• Drugs that may increase the effect of digoxin are alprazolam, amiloride aminoglycoside antibiotics, amiodarone, anticholinergic drugs, benzodiazepines, captopril, clarithromycin, diltiazem, diphenoxylate, dipyridamole, erythromycin, esmolol, felodipine, flecainide, hydroxychloroquine, ibuprofen, indomethacin, itraconazole, nifedipine, nitrendipine, omeprazole, propafenone, propantheline, quinidine, quinine, spironolactone, tetracycline, tolbutamide, triamterene, and verapamil.
• Drugs that may decrease blood levels of digoxin include aminoglutethimide, aminoglycosides, aminosalicylic acid, antacids, anti-cancer combinations, antidiabetes medication, antihistamines, barbiturates, cholestyramine, colestipol, cyclosporine, kaolin-pectin mixtures, metoclopramide, oral kanamycin, oral neomycin, oral sulfonylureas, phenylbutazone, phenytoin and related anti-seizure drugs, rifampin, St. John’s wort, sucralfate, and sulfasalazine.
• Disopyramide may alter the effects of digoxin, although the exact interaction is not well understood.
• Thiazide and loop diuretics, furosemide, ethacrynic acid, and bumetanide increase digoxin’s effect and increase the risk of side effects.
• Spironolactone may increase or decrease the side effects of digoxin; amiloride may reduce the effect of digoxin on the force of heart contraction.
• The effects of digoxin on the heart may be additive to those of ephedrine, epinephrine and other stimulants, beta blockers, calcium salts, procainamide, and rauwolfia drugs.
• Digoxin dosage must be adjusted when it is combined with a thyroid drug.
Food Interactions
These drugs may generally be taken without regard to meals. Taking your medication after a high-fiber meal reduces the amourxtcil drug absorbed into your blood.
Usual OQSS
Adult and Child (age 10 and over): starting dosage—known as the digitalizing or loading dose—is about 4-7 mcg per lb. of body weight. Digitalization may also be accomplished with a lower dosage over 7 days. Maintenance dosage 0.125-0.5 mg; it must be corrected for kidney function. For seniors, a lower dosage is required.
Child (under age 1o): starting dosage-5-30 mcg per lb. of body weight. Maintenance dosage-20-35% of the starting dosage. Careful measurement of your child’s digoxin dosage is crucial to safe and effective treatment.
Overdosage
Adult: Symptoms include appetite loss, nausea, vomiting, diarrhea, headache, weakness, apathy, blurred vision, yellow or green spots or halos before the eyes, yellowing of the skin or whites of the eyes, and changes in heartbeat.
Senior: Vomiting, diarrhea, and eye trouble are frequently seen. Child: An early sign is a change in heart rhythms.
Call your doctor immediately if any of these symptoms appear. Take the victim to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
Take each day’s dose at the same time of day.
Do not stop taking digoxin without your doctor’s knowledge.
Lanoxicaps are better absorbed than tablet forms of digoxin. For this reason, each dose of Lanoxicaps is slightly lower than the corresponding digoxin tablet.
Avoid over-the-counter diet and cold medications containing stimulants.
Call your doctor at once if you develop side effects.
There may by some variation between digoxin tablets from different manufacturers. Do not change drug brands without telling your doctor.
Check your pulse every day—your doctor will teach you how—and call your doctor if it drops below 60 beats per minute.
If you forget a dose and remember at least 12 hours before your next dose, take it right away. If you do not remember until it is less than 12 hours before your next dose, skip the one you forgot and continue with your regular schedule. Do “lot take a double dose. Call your doctor if you M1 a dose for 2 or more days.
Special Populations
Pregnancy/Breast-feeding: Digoxin crosses into the fetal circulation. While digoxin is sometimes used during pregnancy to treat fetal heart disease, women who are or might be pregnant should not take digoxin without their doctor’s approval. When your doc-tor considers this drug crucial, its potential benefits must be care-
fully weighed against its risks.
Small amounts of digoxin pass into breast milk. Nursing mothers who take digoxin should use infant formula.
Seniors: Seniors are more sensitive to digoxin’s effects, especially appetite loss. Seniors with impaired renal function may need lower
dosages.
Generic Name
Diltiazem (dil-TYE-uh-zem) 92
Brand Names
Cardizem Dilt-CD
Cardizem CD Diltia XT
Cardizem LA Diltzac
Cartia XT Taztia XT
Dilator XR Tiazac
Type of Drug
Calcium channel blocker.
Prescribed For
Angina pectoris, chronic stable angina, Raynaud’s disease, prevention of second heart attacks, tardive dyskinesia (severe side effects associated with antipsychotic and other drugs), and hypertension (high blood pressure).
General Information
Diltiazem hydrochloride is one of many calcium channel blockers available in the U.S. These drugs block the passage of calcium, an essential factor in muscle contraction, into the heart and smooth muscles. Such blockage of calcium interferes with the contraction of these muscles, which in turn dilates (widens) the veins and ves sels that supply blood to them. This ditatk”q effect reduces blood pressure, the amount 0 Oxygen used by the heart muscle, and the ~1A 0 blood vessel spasm. Diltiazem is therefore useful in treating not only hypertension but also angina pectoris, a condition related to poor oxygen supply to the heart muscle and characterized by brief attacks of chest pain.
Diltiazem affects the movement of calcium only into muscle cells; it has no effect on calcium in the blood.
Cautions and Warnings
Do not take d,1taz&m1f you are allergic or sensitive to any of its
ingredients.
Diltiazem can slow your heart and interfere with normal electrical conduction. For people with a condition called sick sinus syndrome, this can result in temporary heart stoppage.
Diltiazem should not be taken if you are having a heart attack or if you have lung congestion. Diltiazem should be taken with caution by people with heart failure because it can worsen that condition.
Low blood pressure may occur, especially in people also taking a beta blocker.
Studies have shown that people taking calcium channel blockers—usually those taken several times a day, not those taken once daily—have a greater chance of having a heart attack than people taking beta blockers or another medicine for the same purposes. Discuss this with your doctor to be sure you are receiving the best possible treatment.
Diltiazem can cause severe liver damage and should be taken with caution if you have had hepatitis or any other liver condition.
Caution should also be exercised if you have a history of kidney problems, although no clear tendency toward causing kidney damage is seen with this drug.
Possible Side Effects
♦ Common: dizziness, lightheadedness, weakness, head-
ache, and fluid accumulation in the hands, legs, or feet.
✓ Less common: low blood pressure, fainting, increase or decrease in heart rate, abnormal heart rhythm, heart failure, nervousness, fatigue, nausea, rash, tingling in the hands or feet, hallucinations, temporary memory loss, difficulty sleeping, diarrhea, vomiting, constipation, upset stomach, itching, unusual sensitivity to sunlight, paxnlu) or stiff joints, liver inflammation, and increased urination, especially at night.
Drug Interactions
• Diltiazem taken with a beta-blocking drug for hypertension is usually well tolerated, but may lead to heart failure in people with already weakened hearts.
• Calcium channel blockers, including diltiazem, may add to
the effects of digoxin. This effect is not observed with any
consistency, however, and only affects people with a large
amount of digoxin already in their systems.
• Cimetidine and ranitidine increase the amount of diltiazem in the bloodstream and may account for a slight increase in the drug’s effect.
• Diltiazem may increase blood levels of cyclosporine, carbamazepine, encainide, and theophylline, and thus increase the chance of side effects from these drugs.
• Diltiazem may cause a decrease in blood lithium levels, possibly undermining lithium’s antimanic effect.
• Calcium channel blockers may cause bleeding when taken alone or combined with aspirin.
Food Interactions
Diltiazem is best taken on an empty stomach, at least 1 hour before or 2 hours after meals.
Usual Dose
Immediate-Release Products 30-60 mg 4 times a day.
Sustained-Release/Extended-Release Products Cardizem CD: 120-480 mg once a day. Cardizem LA: 120-540 mg once a day. Cartia XT: 120-300 mg once a day. Dilacor XR: 180-480 mg once a day. Dilt-CD: 120-360 mg once a day. Diltia XT: 180-480 mg once a day. Diltzac: 120-360 mg once a day. Taztia XT: 120-150 mg once a day. Tiazac: 120-360 mg once a day.
Overdosage
Symptoms of diltiazem overdose are very low blood pressure and reduced heart rate. Overdose victims must be made to vomit with 1J)8C2c syrup—available at any pharmacy—within 30 minutes of taking the overdose. Do not induce vomiting if the victim has fainted or is convulsing. If overdose symptoms have developed or more than 30 minutes have passed, vomiting is of little value. Take the victim to a hospital emergency room immediately. ALWAYS bring the prescription bottle or container.
Special information
Call your doctor if you develop any of the following symptoms! swelling of the hands, legs, or feet-, severe dizziness; constipation or nausea; or very low blood pressure.
Do not open, chew, or crush sustained-release capsules of
diltiazem.
If you take your diltiazem 3 or 4 times a day and forget a dose, take it as soon as you remember. Space the remaining doses throughout the rest of the day. If you take diltiazem 1 or 2 times a day and forget to take a dose, take it as soon as you remember. If it is almost time for your next dose, skip the one you forgot and continue with your regular schedule. Never take a double dose.
Special Populations
Pregnancy/Breast-feeding: In animal studies. high doses of diltiazem interfered with the development of the fetus. Diltiazem should not be taken by women who are or might be pregnant. When your doctor considers this drug crucial, its potential benefits must be carefully weighed against its risks.
Because diltiazem passes into breast milk, nursing mothers taking this drug should use infant formula.
Seniors: Seniors may be more sensitive to the effects of this drug because it takes longer to pass out of their bodies.
Aug
1
Clarithromycin
August 1, 2009 | Leave a Comment
Generic Name
Clarithromycin (klah-rith-roe-MYE-sin) 91
Brand Names Biaxin
Type of Drug Macrolide antibiotic.
Biaxin XL
Prescribed For
Mild to moderate infections of the upper and lower respiratory tract, tonsillitis, pharyngitis, sinusitis, exacerbation of chronic bronchitis, middle-ear infections, and for duodenal ulcers; also used for skin and other infections, including membrane attack complex (MAC) in people with advanced HIV infection.
General Information
Clarithromycin and other macybYide antibiotics are either bacteri(;((JW (’UaCkeeia-killing) or bacteriostatic (inhibiting bacterial growth), depending on the organism in question and amount of antibiotic present. In ulcer disease, clarithromycin is used to fight Helicobacter pylori infection, which is present in almost all ulcers and most cases of stomach inflammation.
Cautions and Warnings
Do not take clarithromycin if you are allergic or sensitive to any of its ingredients or to any macrolide antibiotic.
Clarithromycin should not be used during pregnancy.
Clarithromycin is primarily eliminated from the body through the liver and kidneys. People with severe kidney disease may require dose adjustments. Liver disease generally does not require an adjustment.
Colitis (bowel inflammation) has been associated with all antibiotics (see “Possible Side Effects”). If colitis does develop, your doctor should start appropriate treatment. Mild cases of colitis usually respond to the discontinuation of the medicine.
Possible Side Effects
Most side effects are mild and go away once you stop taking clarithromycin.
✓ Most common: nausea, upset stomach, changes in sense of taste, headache, he. diarrhea, abdominal pain, vomiting, and rash in children. Colitis (symptoms include severe abdominal cramps and severe, persistent, and possibly bloody diarrhea) may develop.
✓ Rare: serious abnormal heart rhythms. Contact your doc-
tor if you experience any side effect not listed above.
Drug Interactions
• Clarithromycin may increase the anticoagulant (blood-thinning) effects of warfarin in people who take it regularly, especially older adults. This combination requires careful monitoring by your doctor.
• Do not combine clarithromycin with astemizole or terfenadine.
• Combining clarithromycin and omeprazole raises the amount of both drugs in the blood.
• Two deaths have been reported in people combining Oarithromycin and pimozidp_ ?imuiide should not be used by peibp)e faking a macrolide antibiotic.
• Clarithromycin may raise blood levels of theophylline, possibly leading to a theophylline overdose. It can also increase the effects of caffeine.
• Combining clarithromycin and digoxin, cyclosporine, ergot
alkaloids, or tacrolimus may lead to serious side effects.
Aug
1
Cimetidine
August 1, 2009 | Leave a Comment
Generic Name
Cimetidine (sih-MET-ih-dene)
Brand
Tagamet Tagamet HB 91
Type of Drug Histamine H2 antagonist.
Prescribed For
Ulcers of the stomach and duodenum (upper intestine); also used for upset stomach, gastroesophageal reflux disease (GERD), benign stomach ulcer, bleeding in the stomach and duodenum, colorectal cancer, prevention of stress ulcer, hyperparathyroidism, fungal infections of the hair and scalp, herpes virus infection, excessive hairiness in women, chronic itching of unknown cause, skin reactions, warts, acetaminophen overdose, and other conditions characterized by the production of large amounts of gastric fluids. Cimetidine may be prescribed to stop the production of stomach acid during surgery.
General Information
Histamine H2 antagonists work by turning off the system that produces stomach acid and other secretions. Cimetidine is effective in treating the symptoms of ulcer and preventing complications of the disease, although an ulcer that does not respond to another histamine H2 antagonist will probably not respond to cimetidine. Histamine H2 antagonists differ only in their potency. Cimetidine is the least potent; 1000 mg are roughly equal to 300 mg of either nizatidine or ranitidine, or 40 mg of famotidine. These drugs are roughly equal in their ability to treat ulcer disease and their risk of side effects.
Cautions and Warnings
Do not take cimetidine if you are allergic or sensitive to any of its ingredients or any histamine H2 antagonist. Cimetidine has a mild antiandrogen effect, which probably causes the painful, swollen breasts that some people experience after taking this drug for a month or more.
People with kidney or liver disease should take cimetidine with caution because 1/3 of each dose is broken down in the liver and passes out of the body through the kidneys.
Do not self-treat with over-the-counter forms of cimetidine without the advice and supervision of your doctor.
The fact that symptalleviated by cimetidine does not dude the possibility of stomach cancer, which can have symptoms similar to other gastrointestinal (GI) disorders. Make sure your doctor screens for possible malignancy.
these symptoms stop 3-4 days after discontinuing the drug. Call your doctor if this happens to you.
Possible Side Effects
Serious side effects are uncommon.
♦ Most common: mild diarrhea, dizziness, rash, painful breast swelling, nausea and vomiting, headache, confusion, drowsiness, hallucinations, and impotence.
♦ Less common: liver inflammation, peeling or red and swollen rash, breathing difficulties, tingling in the hands or feet, delirious feelings, and oozing from the nipples.
✓ Rare: Cimetidine may affect white blood cells or blood platelets. Some symptoms of these effects are unusual bleeding or bruising, unusual tiredness, and weakness. Other rare side effects are inflammation of the pancreas, hair loss (reversible), abnormal heart rhythms, heart attack, muscle or joint pains, and drug reactions. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
• Separate cimetidine from antacid doses by about 3 hours to avoid reducing cimetidine’s effectiveness. Other drugs that may reduce the absorption of cimetidine are metoclopramide and anticholinergic drugs, including trihexyphenidyl hydrochloride, oxybutynin, and benztropine mesylate.
• Cigarette smoking reverses the healing effect cimetidine has on ulcers.
• Cimetidine may increase the side effects of a variety of drugs, possibly leading to drug toxicity. These drugs include alcohol; aminophylline; oral antidiabetes drugs; benzodiazepine sedatives, except lorazepam, oxazepam, and temazepam; caffeine; calcium channel blockers; carbamweoine; carmustine; chloroquine; tkeCaiTAe; fluorouracil; labetalol; lidoQa« , Tneloprolol; metronidazole; moricizine; mexiletine; narcotic pain relievers; nifedipine; ondansetron; pentoxifylline; phenytoin; procainamide; propafenone; propranolol; quinine; quinidine; tacrine; theophylline drugs, except clyphylline: triamterene; tricyclic antidepressants; valproic acid; and warfarin (a blood-thinner).
• Drugs whose absorption may be decreased by cimetidine are iron, indomethacin, fluconazole, ketoconazole, and tetra-
cycline antibiotics.
• Enteric-coated tablets should not be taken with cimetidine. The change in stomach acidity causes the tablets to disin-
tegrate prematurely in the stomach.
• cimetidine may decrease the effects of digoxin and tocainide.
Food Interactions
None known.
Usual Dose
Adult: 400-800 mg at bedtime; 300 mg 4 times a day with meals and at bedtime; or 400 mg twice a day. To treat GERD-400 mg 4 times a day. Do not exceed 2400 mg a day. Users of Tagamet HB should not take more than 400 mg a day. Smaller doses may be as effective for seniors or those with impaired kidney function.
Overdosage
Little is known about the effects of cimetidine overdose, but victims may experience exaggerated side effects. Two deaths have occurred. Your local poison control center may advise giving ipecac syrup—available at any pharmacy—to induce vomiting and remove any drug remaining in the stomach. Victims who have definite symptoms should be taken to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
Take cimetidine exactly as directed and follow your doctor’s instructions regarding diet and other treatment in order to get the maximum benefit from the drug.
Do not take the maximum dose continuously for more than 2 weeks without the consent and supervision of your doctor.
Cigarette smoking is associated with stomach ulcers and reduces cimetidine’s effectiveness.
Call your doctor at once if you develop any unusual side effects such as bleeding or bruisiiAg, tiredness, diarrhea, dizziness, rash, 131 NMbdinations. Black, tarry stools or vomiting material that resembles coffee grounds may indicate your ulcer is bleeding.
If you miss a dose of cimetidine, take it as soon as possible. If it is almost time for your next dose, skip the dose you forgot and continue with your regular schedule. Do not take a double dose.
Special Populations
Pregnancy/Breast-feeding: Animal studies reveal no damage to the fetus, although cimetidine does pass into the fetal blood. When this drug is considered crucial by your doctor, its potential benefits must be carefully weighed against its risks.
Large amounts of cimetidine pass into breast milk. Nursing mothers who must take this drug should use infant formula.
Seniors: Seniors may need less medication due to loss of kidney function and be more susceptible to side effects, especially confusion and other nervous system effects (see “Cautions and Warnings”).
Aug
1
Cholinesterase Inhibitors
August 1, 2009 | Leave a Comment
Type of Drug
Cholinesterase Inhibitors
(KO-lin-ESS-tuh -rase)
Brand Names
Generic Ingredient.- Donepezil
Aricept Aricept ODT
Generic Ingredient: Galantamine
Razadyne Razadyne ER
Generic Ingredient: Rivastigmine
Exelon Exelon Transdermal System
Generic Ingredient: Tacrine Cognex
Prescribed For
Alzheimer’s disease. Also used for vascular dementia, dementia associated with Parkinson’s disease, poststroke aphasia (problems with language), and improvement of memory in multiple sclerosis patients.
General Information
Cholinesterase inhibitors work by increasing the function of certain receptors in the brain that are stimulated by the hosmone acetylcholine. They do t.Ns by interfering with cholinesterase, the 1617yme that breaks down acetylcholine. People with Alzheimer’s disease (a degenerative condition of the central nervous system) develop a shortage of this brain chemical early in the disease. There is no evidence that cholinesterase inhibitors reverse the degenerative effects of Alzheimer’s, but they may slow the rate at which the disease worsens.
Cautions and Warnings
Do not take cholinesterase inhibitors if you are allergic or sensitive to any of their ingredients.
Cholinesterase inhibitors must be discontinued before surgery because they increase the effects of anesthetic drugs.
People with heart disease should use cholinesterase inhibitors with caution because they may slow heart rate and cause fainting. Two studies of people with mild symptoms of Alzheimer’s disease taking galantamine revealed a higher rate of death from heart attack, stroke, or sudden death.
Cholinesterase inhibitors may be expected to cause increased stomach acid production and increased activity of the gastrointestinal tract. Possible complications include ulcers or bleeding. Alcohol and nonsteroidal anti-inflammatory drugs (NSAIDs) such as aspirin or ibuprofen may worsen this effect.
Using cholinesterase inhibitors may also lead to urinary blockage, increase the risk of generalized seizures, and worsen asthma or other pulmonary diseases. Use with caution if you have these conditions.
People with severe liver dysfunction should not take galantamine or tacrine.
Possible Side Effects
People taking cholinesterase inhibitors generally experience side effects at about the same rate as those taking a placebo (sugar pill).
♦ Most common: headache, general pain, accidents, nausea, diarrhea, sleeplessness, and dizziness.
✓ Common: tiredness, vomiting, appetite loss, and muscle cramps.
♦ Less common: arthritis, depression, abnormal dreams, fainting, black-and-blue marks, and weight loss.
✓ Rare: Rare side effects can occur in almost any part of the body. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
• Cholinesterase inhibitors interfere with anticholinergic drugs (often prescribed for stomach disorders).
• Cholinesterase inhibitors can be expected to increase the ef-
fects of cevimeline, surgical anesthetic drugs, and drugs that
irritate the stomach and intestines, such as aspirin, ibupro-
fen, and other NSAIDs.
• The breakdown of cholinesterase inhibitors (except rivastigmine) in the liver can be slowed by ketoconazole, itraconazole, quinidine, delavirdine, indinavir, nelfinavir, ritonavir, saquinavir, amiodarone, cimetidine, ciprofloxacin, norfloxacin, clarithromycin, diltiazem, erythromycin, fluconazole, fluvoxamine, celecoxib, chlorpheniramine, clomipramine, cocaine, doxorubicin, fluoxetine, halofantrine, halopendol, levopromazine, methadone, mibefradil, paroxetine, ranitidine, terbinafine, mifepristone, nefazodone, and grapefruit juice.
• The breakdown of cholinesterase inhibitors (except rivastigmine) in the liver can be increased by efavirenz, nevirapine, barbiturates, carbamazepine, corticosteroids, phenytoin, pioglitazone, and rifampin.
Food Interactions
Donepezil can be taken with or without food.
Galantamine and rivastigmine should be taken with morning and evening meals.
The rivastigmine transdermal system patch can be used without regard to meals.
Food reduces the absorption of tacrine into the blood. It is best taken on an empty stomach, but you can take it with food if it upsets your stomach.
Usual Dose
Donepezil
Adult: 5 or 10 mg once a day.
Galantamine
Adult: 8-32 mg a day.
Rivastigmine
Adult: 3-12 mg a day, divided into 2 doses.
RiVUtq1M&A0Y2nsdermaI patch
Adult: Apply one 4.6-mg patch every day to start. Dose may be increased to one 9.5-mg patch every day.
Tacrine
Adult: 40-160 mg a day, divided into 4 doses.
Overdosage
Cholinesterase inhibitor overdose can be very serious. Symptoms include severe nausea, vomiting, salivation, sweating, slow heart rate, low blood pressure, slow breathing rate, convulsions, muscle weakness, and collapse. Take the overdose victim to a hospital emergency room at once. ALWAYS bring the prescription bottle or container.
Special Information
Donepezil should be taken just before bedtime.
Follow the special package directions for rivastigmine solution.
Do not remove the rivastigmine patch from its packaging until just before you are ready to apply it. Apply the patch to clean, dry, and hairless skin on the upper or lower back, upper arm, or chest that is also free of any powder, oil, moisturizer, or lotion that could keep the patch from sticking to your skin properly; skin should also be free of cuts, rashes, and irritations. Avoid places where the patch can be rubbed off by tight clothing. When changing your patch, apply your new patch to a different spot of skin (for example, on the right side of your body one day, then on the left side the next day). Do not use the same spot more than once every 14 days. Wear only one patch at a time and change it every.24 hours. If the patch falls off, apply a new patch for the rest of the day, then replace the patch the next day at the same time as usual.
Tobacco or nicotine use increases the rate at which tacrine and rivastigmine are cleared from the body.
If you forget a dose and take your medication once a day, take it as soon as you remember. If it is almost time for your next dose, skip the dose you forgot and continue with the regular schedule. If you take your medication 2 or more times a day, take your dose as soon as you remember. If it is almost time for your next dose, skip the dose you forgot and continue with your regular schedule. Do not take a double dose.
Special Populations
Pregnancy/Breast-feeding: One animal study of a cholinesterase inhibitor indicated a small risk of birth defects. When your doctor considers this drug crucial, its potential benefits must be carefully weighed against its risks.
It is not known if cholinesterase inhibitors pass into breast milk. Nursing mothers who must take this drug should use infant formula.
Seniors: Seniors with moderate kidney function loss should not take galantamine. Dosage adjustments are not needed for donepezil, tacrine, or rivastigmine.
Aug
1
Cevimeline
August 1, 2009 | Leave a Comment
Generic Name
Cevimeline (seh-VIM-ih-lene) 9
Brand Name Evoxac
Type of Drug Cholinergic.
Prescribed For
Dry mouth in people with syndrome.
General Information
Sj6gren’s syndrome jS a group 0j symptoms related to a lack of bodily secretions. People with this condition have very dry eyes and mucous membranes, facial lesions, and neck swelling. It often occurs in menopausal woman and is often associated with rheumatoid arthritis, poor blood circulation in the legs, and tooth decay. Cevimeline increases secretions in the mouth by binding to specific nervous system receptors and causing the release of more saliva.
Cautions and Warnings
Do not take cevimeline if you are allergic or sensitive to any of its
ingredients.
This drug may make breathing more difficult and worsen lung conditions such as asthma, chronic bronchitis, or chronic obstructive pulmonary disease (COPD).
Eye conditions like glaucoma or inflammation of the iris may be worsened by cevimeline.
Cevimeline may affect the heart, and some people with severe heart disease, including those with a history of severe angina or heart attack, may not be able to compensate for this effect.
Cevimeline may worsen gallstones and kidney stones and should be avoided by people with a history of these conditions.
Cevimeline may cause visual blurring, especially at night.
Possible Side Effects
✓ Most common: excessive sweating, headache, nausea, sinus irritation, respiratory infection, runny nose, and diarrhea.
✓ Common: upset stomach, abdominal pains, urinary infection, coughing, and sore throat.
✓ Less common: vomiting, back pain, injury, rash, conjunctivitis (pinkeye), dizziness, bronchitis, severe joint pain, fatigue, bone pain, sleeplessness, hot flushes, excess salivation, chills, and anxiety.
✓ Rare: frequent urination, weakness, and flushing. Other rare side effects can occur in almost any part of the body. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
• Combining cevimeline with a beta blocker can lead to heart rhythm disturbances.
• Cevimeline may interfere with the effects of anticholinergics, found in Some medications for abdominal or stomach spasms or cramps.
• Cholinergics such as bethanechol, donepezil, physostigmine, pilocarpine, and pyridostigmine can add to the effects of cevimeline.
• Some drugs may interfere with the breakdown of cevimeline in the liver, increasing the chance of drug side effects. These include amiodarone, celecoxib, chlorpheniramine, cimetidine, ciprofloxacin, clarithromycin, clomipramine, cocaine, diltiazem, erythromycin, fluconazole, fluoxetine, halofantrine, indinavir, itraconazole, ketoconazole, methadone, mibefradil, nelfinavir, paroxetine, quinidine, ranitidine, ritonavir, saquinavir, and terbinafine.
Food Interactions
Grapefruit juice may interfere with the breakdown of cevimeline in the liver, increasing the chance of drug side effects. Food interferes with the absorption of cevimeline into the bloodstream. Take this drug on an empty stomach.
Usual Dose
Adult: 30 mg 3 times a day. Child: not recommended.
Overdosage
Overdose symptoms can include exaggerated drug side effects including headache, visual impairment, excess tearing and/or sweating, difficulty breathing, stomach or intestinal spasms, nausea, vomiting, diarrhea, changes in heart rhythm, blood pressure changes, shock, mental confusion, and tremors. Overdose victims should be taken to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
cevimeline may cause blurred vision, possibly interfering with driving or performing tasks that require reliable vision, especially at night or in low light.
If you sweat excessively while taking cevimeline, be sure to drink a lot of water. Excessive sweating can lead to dehydration.
If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose.
Special Populations
Pregnancy/Breast-feeding: Pregnant women should take cevimeline only if it is considered crucial by your doctor, since its effect on the developing fetus is not known.
It is not known if cevimeline passes into breast milk, but nursing mothers who must take this drug should consider using infant formula.
Seniors: Older adults should be cautious about using this drug because of its possible effects on the kidney, liver, and heart, and on other diseases or medications.
Aug
1
Cetirizine
August 1, 2009 | Leave a Comment
Generic Name
Cetirizine (seh-TERE-ih-zene)
Brand Name Zyrtec
The information in this profile also applies to the following drugs:
Generic Ingredient: Azelastine
Generic Ingredient: Fexofenadine 91 Allegra
Generic Ingredient: Levocetirizine 91 Xyzal
Type of Drug Antihistamine.
Prescribed For
Azelastine: runny nose, sneezing, nasal itching, and post-nasal drip. Cetirizine: stuffy and runny nose, itchy eyes, and scratchy throat caused by seasonal and year-round allergy, and for other symptoms of allergy such as rash, itching, and hives; also prescribed for chronic itching and for asthma. Fexofenadine: sneezing, stuffy and runny nose; scratchy throat and mouth; and itchy, watery, and red eyes caused by seasonal allergies. Levocetirizine: stuffy and runny nose, itchy eyes, and scratchy throat caused by seasonal and year-round allergy, and for other symptoms of allergy such as rash, itching, and hives; also prescribed for chronic itching.
General Information
Antihistamines generally work by blocking the release of histamine (a chemical released by body tissue during an allergic reaction) from the cell at the H, histamine receptor site, drying up secretions of the nose, throat, and eyes. Cetirizine causes less sedation than older antihistamines and appears to be just as effective. Levocetirizine is the active portion of the cetirizine molecule and is as effective as cetirizine with a similar side effect profile.
Cautions and Warnings
Do not take cetirizine if you are allergic or sensitive to any of its ingredients.
People with kidney disease should receive reduced dosages of cetirizine and levocetirizine. Do not take these drugs if kidney disease is severe. Children with kidney disease should not receive levocetirizine.
Possible Side Effects
✓ Common: headache, drowsiness, fatigue, dry mouth, bitter taste in the mouth, dizziness, runny nose, and sore throat.
✓ Less common: nosebleeds, stuffy nose, sneezing, cough, nausea, upset stomach, changes in bowel habits, nervousness, and fever (children).
♦ Rare: fainting and weight gain. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
• Cimetidine may increase the level of azelastine in the blood.
• Cetirizine is less likely than other antihistamines to interact with drugs.
• Ritonavir increases the amount of levocetirizine and slows its breakdown in the body. This may result in increased levocetirizine side effects.
Food Interactions
• Ceterizine and levocetirizine may be taken without regard to food or meals.
Usual Dose
Azelastine Nasal Spray
Adult and Child (age 12 and over): 1-2 sprays in each nostril twice a day.
Child (age 5-11): 1 spray in each nostril twice a day.
Cetirizine
Adult and Child (age 6 and over): 5-10 mg once a day depending on symptoms. Reduce dosage in people with kidney disease. Child (age 1-5): 2.5-5 mg a day.
Child (age 6 months-1 year): 2.5 mg a day.
Fexofenadine
Adult (age 12 and over): 60 mg twice a day or 180 mg once a day. People with kidney disease should take 60 mg a day.
Child (age 6-11): 30 mg twice a day.
Levocetirizine
Adult and Child (age 12 and over): 5 mg every evening.
Child (age 6-11): 2.5 mg (1h tablet) every evening. Dosage for children should not exceed 2.5 mg a day. Child (under age 6): not recommended.
Overdosage
Drug overdose is likely to cause severe side effects. Overdose victims should be Oven ipecac syrup—available at any pharmacy—to make them vomit and be taken to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
Use extra caution while doing anything that requires concentration, such as driving a car or operating hazardous machinery.
Report sore throat, unusual bleeding, bruising, tiredness, weakness, or any other unusual side effect to your doctor. Do not combine these drugs with alcohol or other nervous system depressants. Do not put azelastine nasal solution into your eyes.
If you forget to take a dose of cetirizine, take it as soon as you remember. If it is almost time for your next dose, skip the one you forgot and continue with your regular schedule. Do not take a double dose.
Special Populations
Pregnancy/Breast-feeding: Oral antihistamines are generally considered safe for use during pregnancy. But do not take any antihistamine without your doctor’s knowledge if you are or might become pregnant—especially during the last 3 months of pregnancy, because newborns may have severe reactions to antihistamines.
Small amounts of antihistamine pass into breast milk. Nursing mothers who must take cetirizine should use infant formula.
Seniors: Antihistamines are more likely to cause dizziness, sleepiness, and confusion in seniors. Dosage reduction may be recommended depending on kidney function.
Jul
16
Alprazolam
July 16, 2009 | Leave a Comment
Generic Name
Alprazolam (al-PRAY-zoe-lam) CGI
Brand Names
Niravam Xanax Xanax XR Type of Drug
Benzodiazepine sedative.
Prescribed For
Generalized anxiety disorder and anxiety associated with depression; panic disorder with or without agoraphobia.
General Information
Alprazolam is a member of a group :)f drugs known as benzodiazepines. Benzodiazepines directly affect the brain. They can relax you and make you more tranquil or sleepier, or they can slow nervous system transmissions in such a way as to act as an anticonvulsant. Many doctors prefer benzodiazepines to other drugs that can be used to similar effect because they tend to be safer, have fewer side effects, and are usually as effective, if not more so.
Cautions and Warnings
Do not take alprazolam if you know you are allergic or sensitive to it or to another benzodiazepine drug, including clonazepam.
Alprazolam can aggravate narrow-angle glaucoma, but you may take it if you have open-angle glaucoma and are receiving therapy for it.
Other conditions where alprazolam should be avoided are: severe lung disease, sleep apnea (intermittent cessation of breathing during sleep), liver disease, drunkenness, and kidney disease. In each of these conditions, the depressive effects of alprazolam may be enhanced or could be detrimental to your overall condition.
Alprazolam should not be taken by psychotic patients because it is not effective for them and can trigger unusual excitement, stimulation, and rage.
Alprazolam is meant to be used for no more than 3-4 months in a row. Your condition should be reassessed before continuing your medicine beyond that time.
Alprazolam may be addictive. When used to treat panic disorder, alprazolam is frequently prescribed in doses exceeding 4 mg a day. Studies show that these higher doses may cause physical and emotional dependence, making it very difficult to stop taking the drug. Drug withdrawal may develop if you stop taking it after only 4 weeks of regular use but is more likely after longer use and at higher doses. It may start with anxiety and progress to tingling in the hands or feet, sensitivity to bright light, sleep disturbances, cramps, tremors, muscle tension or twitching, poor concentration, flu-like symptoms, fatigue, appetite loss, sweating, and changes in mental state. Severe withdrawal symptoms may include seizures.
Your dosage should be reduced gradually (0.5 mg decrease every 3 days) to prevent drug withdrawal symptoms.
Possible Side Effects
V Most common: mild drowsiness during the first few days of therapy. Weakness and confusion may occur, especially in seniors and in those who are sickly. If these effects persist, contact your doctor.
V Less common: depression, lethargy, disorientation, headache, inactivity, slurred speech, stupor, dizziness, tremors, constipation, dry mouth, nausea, inabilityto control urination, Possible Side Effects (continued)
sexual difficulties, irregular menstrual cycle, changes in heart rhythm, low blood pressure, fluid retention, blurred or double vision, itching, rash, hiccups, nervousness, inability to fall asleep, and occasional liver dysfunction. If you experience any of these symptoms, stop taking the medicine and contact your doctor immediately.
V Rare: withdrawal seizures. Rare side effects can occur in almost any part of the body. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
• Alprazolam is a central-nervous-system depressant. Avoid alcohol, other sedatives, narcotics, barbiturates, monoamine oxidase inhibitor (MAGI) antidepressants, antihistamines, and antidepressants. Taking alprazolam with these drugs may result in excessive depression, tiredness, sleepiness, breathing difficulties, or related symptoms.
• Smoking may reduce the amount of alprazolam in your blood by 50%. Smokers may need larger doses.
• The effects of alprazolam may be prolonged when taken together with cimetidine, contraceptive drugs, disulfiram, fluoxetine, isoniazid, itraconazole, ketoconazole, metoprolol, probenecid, propoxyphene, propranolol, and valproic acid.
• The effects of some benzodiazepines may be decreased by rifampin.
• Theophyllines may reduce alprazolam’s sedative effects.
• If you take antacids, separate them from your alprazolam dose by at least 1 hour to prevent them from interfering with the absorption of alprazolam into the bloodstream.
• Alprazolam may raise digoxin blood levels and the chances of digoxin toxicity.
• The effect of levodopa + carbidopa may be decreased if it is taken together with alprazolam.
• Combining alprazolam with phenytoin may increase phenytoin blood concentrations and the chances of phenytoin toxicity.
Food Interactions
Alprazolam is best taken on an empty stomach but may be taken with food if it upsets your stomach.
Usual Dose
Anxiety Disorder
Adult: 0.25-0.5 mg 3 times a day. Dosage must be tailored to your individual needs with a maximum dose of 4 mg a day. Child (under age 18): not recommended.
Panic Disorder
Adult: 1 -10 mg a day.
Child (under age 18): not recommended.
Overdosage
Symptoms of overdose are confusion, sleepiness, poor coordination, lack of response to pain such as a pinprick, loss of reflexes, shallow breathing, low blood pressure, and coma. The victim should be taken to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
Alprazolam can cause tiredness, drowsiness, inability to concentrate, or related symptoms. Be careful if you are driving, operating machinery, or performing other activities that require concentration.
Anyone taking alprazolam for more than 3 or 4 months at a time may have a drug withdrawal reaction if the medicine is stopped suddenly (see “Cautions and Warnings”). Do not stop taking alprazolam, or increase or decrease the dosage, without first consulting your doctor.
If you forget a dose of alprazolam, take it as soon as you remember. If it is almost time for your next dose, skip the dose you forgot and return to your regular schedule. Do not take a double dose. If you take Xanax XR, take your full daily dose once a day in the morning. Do not chew or crush Xanax XR tablets.
Special Populations
Pregnancy/Breast-feeding: Alprazolam may cause birth defects if taken during the first 3 months of pregnancy. You should avoid alprazolam while pregnant.
Alprazolam may pass into breast milk. Nursing mothers who must take alprazolam should use infant formula.
Seniors: Seniors, especially those with liver or kidney disease, are more sensitive to the effects of alprazolam and generally require smaller doses to achieve the same effect.
Jul
16
Aliskiren
July 16, 2009 | Leave a Comment
Generic Name
Aliskiren (ah-LISS-kih-ren)
Brand Name Tekturna
Combination Product
Generic Ingredients: Aliskiren + Hydrochlorothiazide Tekturna HCT
Type of Drug
Direct renin inhibitor. Prescribed For
High blood pressure.
General Information
Renin is produced by the kidney in response to a reduction in blood volume and the amount of blood passing through the kidney. Once in the blood, renin reacts with other hormones to forma very powerful blood vessel constrictor called angiotensin E that directly raises blood pressure. Renin also works with a hormore called aldosterone to raise blood pressure and it prevents sodium from being eliminated from the body. This increases the amount of water in the system, raising blood volume and increasing blood pressure. Aliskiren inhibits renin and all of its actions, thereby !owering blood pressure. The blood pressure lowering is usually seen with 2 weeks of starting on treatment. When aliskiren treatment is stopped, blood pressure gradually rises to pre-treatment levels. Only about 21/2% of any dose is absorbed into the blood and it takes about a week to reach a steady level in the blood. Most of the drug that is absorbed is broken down in the liver. The rest passes out of the body unchanged in the urine. Aliskiren may be used alone or with other hypertensives, however its use with maximum doses of an ACE inhibitor has not been adequately studied.
Cautions and Warnings
Do not take aliskiren if you are allergic or sensitive to any of its ingredients.
Angioedema swelling of the face, hands or feet, tongue, or throat can occur at any time during aliskiren treatment. If this happens, stop taking the medicine and go to your doctor’s office or a hospital emergency room for treatment. This reaction can interfere with your breathing.
The safety of aliskiren in people with moderate to severe kidney disease is not known.
The combination of aliskiren and an ACE inhibitor can lead to high blood levels of potassium.
Aliskiren may be less effective in some black patients with high blood pressure, especially when dietary salt intake is high. Nevertheless, it should still be considered a useful blood pressure treatment.
Possible Side Effects
✓ Common: nausea, dizziness, and sleeplessness.
✓ Less common: diarrhea, abdominal pain, upset stomach, GERD, cough, rash high blood uric acid levels, gout, kidney stones, headache, nose and throat irritation, fatigue, upper respiratory infection, and back pain.
✓ Rare: difficulty breathing; swelling of the hands, face, eyes, or whole body; and seizures. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
• Mixing aliskiren with irbesartan can reduce the amount of aliskiren into the blood by 50%. This may reduce the effectiveness of aliskiren.
• Aliskiren has been studied together with both hydrochlorothiazide and valsartan and can be combined with them in blood pressure management. It has been used with amlodipine but may not be better than high dose amlodipine alone.
• Aliskiren’s interaction with ACE inhibitors is not yet fully known.
• Atorvastatin and ketoconazole slow the breakdown of aliskiren, resulting in an increase of aliskiren blood levels by 50% or more. Dosage adjustment may be necessary.
Aliskiren can reduce blood levels of the diuretic furosemide, reducing the diuretic’s effect.
Food Interactions
Aliskiren can be taken without regard to food or meals. Avoid taking it with high fat meals because they can drastically reduce the amount of aliskiren absorbed into the blood.
Usual Dose
Adult (age 18 and over)
Tekturna: 50-300 mg at the same time every day. Tekturna HCT. 1 tablet a day.
Child: not recommended. Overdosage
The most likely symptom of overdose is low blood pressure (symptoms include dizziness and fainting). If you think you have taken an overdose, call your doctor or go to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
Call your doctor at once if you develop swelling of the face, eyes, lips, tongue, or throat; difficulty swallowing or breathing; hoarseness; or other signs of a drug reaction or allergy.
If you forget a dose, take it as soon as you remember. If you do not remember until it is almost time for your next dose, skip the dose you forgot and continue with your regular schedule. Do not take a double dose.
Special Populations
Pregnancy/Breast-feeding: Aliskiren can injure or kill a developing fetus. Pregnant women should not take aliskiren. Women who suspect they are pregnant must call their doctor at once and stop taking aliskiren when pregnancy is confirmed. In those rare cases where aliskiren is considered life-saving for the mother and there is no substitute for aliskiren, your doctor may advise that you continue on the medicine and then check your baby’s development with periodic ultrasound examinations.
It is not known if this drug passes into breast milk. Nursing mothers should use infant formula.
Seniors: Seniors may have higher blood levels of aliskiren and be more susceptible to drug side effects, but starting dose adjustment is not required.
Jul
16
Adefovir
July 16, 2009 | Leave a Comment
Generic Name
Adefovir (ah-deh-FOE-veer)
Brand Name Hepsera
Type of Drug Antiviral.
Prescribed For
Chronic active hepatitis B in adults.
General Information
Hepatitis B is one of several different types of hepatitis, a viral infection of the liver. Adefovir is an antiviral drug that can reduce the amount of hepatitis B virus in the bloodstream and slow its spread to healthy liver tissue, however, it cannot cure chronic hepatitis B. People with chronic hepatitis B may develop liver cirrhosis or liver cancer and it is not known if adefovir can prevent these conditions from occurring. Like other viruses and bacteria, the hepatitis B virus can become resistant to the effects of adefovir.
Adefovir works against the hepatitis C virus in a way similar to that of certain human immunodeficiency virus (HIV) drugs. It interferes with an enzyme called reverse transcriptase, which is an essential component of the viral reproduction process. Almost half of each dose is eliminated via the urine within 24 hours of taking it.
Cautions and Warnings
Do not take adefovir if you are allergic or sensitive to any of its ingredients.
Adefovir can be toxic to the kidneys, especially in people who already have some kidney problems. Since it is eliminated from the body through the kidneys, people with kidney disease are often given lower doses of adefovir.
In some cases, hepatitis can become severely aggravated upon discontinuation of adefovir. Your doctor should check your liver for’ 2 weeks after the drug is stopped. it is possible that antiviral therapy may have to be re-started.
Adefovir has some activity against the human immunodeficiency virus (HIV). An HIV blood test is recommended before starting adefovir treatment. If you are HIV positive, adefovir could make the HIV virus resistant to future antiviral drugs.
People taking adefovir can develop liver disease, liver enlargement, fat degeneration, and lactic acidosis (potentially fatal metabolic imbalance). This may be a reason for your doctor to stop your adefovir treatment. This occurs most frequently in obese women.
Possible Side Effects
In studies, side effects reported in the treated group were similar in frequency to placebo.
✓ Most common: weakness, headache, stomach pain, and nausea.
✓ Less common: intestinal gas, diarrhea, and upset stomach.
Drug Interactions
This drug was studied extensively in an attempt to predict possible drug interactions. No major interaction problems have been revealed.
• Taking drugs that can be toxic to the kidneys (such as amino-glycosides, cyclosporine, nonsteroidal anti-inflammatory drugs (NSAIDs), tacrolimus, and vancomycin) together with adefovir can lead to the more rapid appearance of kidney damage.
• Ibuprofen, when taken in dosages of 800 mg 3 times a day, will increase adefovir blood levels by about 20 %, however the importance of this finding is unknown.
Food Interactions
Adefovir may be taken without regard to food or meals.
Usual Dose
Adults: 10 mg once a day. People with kidney disease requiring dialysis may take only 10 mg a week. The exact dosage is based on the severity of kidney disease.
Child: not recommended.
Overdosage
Gastrointestinal symptoms are the most likely outcome of an adefovir overdose. Take the victim to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
Practice safe sex and safe needle use. People taking adefovir may still spread hepatitis B through sexual contact or by sharing needles. Practice safe sex using condoms and dental dams.
Do not share personal items that can have blood or body fluids on them, such as toothbrushes or razor blades.
Try to take adefovir at the same time every day.
Adefovir must be taken continuously to maintain its effectiveness. Be sure to keep enough adefovir on hand so that you do not run out of medicine.
If you take adefovir on a regular schedule and forget a dose, take it as soon as you remember. If it is almost time for your next dose, skip the forgotten dose and continue with your regular schedule. Do not take a double dose of this medicine. Call your doctor if you forget 2 or more doses in a row. Skipping or forgetting too many doses can make the hepatitis C virus resistant to adefovir.
Call your doctor at once if you feel very weak or tired, cold (especially in your arms and legs), dizzy or lightheaded, have unusual muscle pain, trouble breathing, stomach pain with nausea and vomiting, or have a fast or irregular heartbeat. These could be signs of lactic acidosis.
Call your doctor if you experience jaundice (symptoms include yellowing of the skin or whites of the eyes), appetite loss for a few days or more, lower stomach pain, nausea, dark urine, or bowel movements that are light in color. These could be signs of liver toxicity.
Special Populations
Pregnancy/Breast-feeding: Animal studies with adefovir have revealed a tendency for some birth defects when the dosage administered was more than 20 times the average human dose. There is no information on the effect of adefovir during pregnancy. The company that produces adefovir has established a registry to collect information on pregnant women who take this drug. When this drug is considered crucial by your doctor, its potential benefits may be carefully weighed against its risks.
It is not known if adefovir passes into breast milk. Nursing mothers who must take it should use infant formula.
Seniors: Seniors may be more sensitive to adefovir’s side effects because of the natural loss of kidney function that occurs with advancing age.
Jul
16
Acyclovir
July 16, 2009 | Leave a Comment
Generic Name
Acyclovir (ae-SYE-kloe-vir) 4i
Brand Name Zovirax
Type of Drug Antiviral.
Prescribed For
Initial treatment and maintenance of genital herpes outbreaks; treatment of herpes zoster (shingles); and treatment of varicella (chickenpox).
General Information
Acyclovir is the only oral drug that reduces growth rates of the herpes virus and the related viruses, Epstein-Barr, varicella, and cytomegalovirus (CMV); both oral acyclovir and oral ganciclovir work against CMV Intravenous drugs, including acyclovir injection, may also be used for these viral infections; however, intravenous antiviral drugs are usually reserved for patients with HIV, cancer, or otherwise compromised immune systems.
Acyclovir is selectively absorbed into cells that are infected with the herpes simplex virus, where it is converted into its active form. Acyclovir works by interfering with the reproduction of viral DNA, slowing the growth of existing viruses. It has little effect on recurrent infections. To treat both local and systemic (whole-body) symptoms acyclovir must be given by intravenous injection or taken by mouth. Local symptoms may be treated with the ointment alone. Oral acyclovir may be taken every day to reduce the number and severity of herpes attacks in people who suffer 10 or more attacks a year; it may also be used to treat intermittent attacks as they occur, but treatment must be started as soon as possible to have the greatest effect.
Cautions and Warnings
Do not use acyclovir if you are allergic or sensitive to any of its ingredients. Do not use acyclovir ointment if you have had an allergic reaction to it or to the major component of the ointment base, polyethylene glycol. Do not apply acyclovir ointment inside the vagina because the polyethylene glycol base may cause irritation and swelling of sensitive vaginal tissue. Acyclovir ointment is not intended for use in the eye and should not be used to treat a herpes infection of the eye.
Renal failure has occurred in patients using oral acyclovir, in some cases resulting in death. People with kidney impairment should have dosages adjusted accordingly.
Maintain adequate hydration while taking oral acyclovir. Animal testing indicates that acyclovir may affect fertility in men. These effects may be reversible.
Possible Side Effects
Capsules, Suspension, and Tablets
✓ Most common: feeling unwell, headache, diarrhea, nausea, and vomiting.
✓ Less common: appetite loss, stomach gas, constipation, fatigue, rash, leg pains, sore throat, a bad taste in the mouth, sleeplessness, and fever.
♦ Rare: aching joints, weakness, and tingling in the hands or feet. Contact your doctor if you experience any side effect not listed above.
Ointment
✓ Most common: mild burning, irritation, rash, and itching. These effects are more likely to occur when treating an initial herpes attack than a recurrent attack. Women are 4 times more likely to experience burning than men.
Drug Interactions
• Do not apply acyclovir together with any other ointment or topical medication.
• Oral probenecid may decrease elimination of acyclovir from the body, which increases blood levels of oral or injected acyclovir, increasing the risk of side effects.
• Combining acyclovir and zidovudine (an HIV drug—also known as AZT) may lead to severe drowsiness and lethargy.
Food Interactions
Acyclovir may be taken with food if it upsets your stomach.
Usual Dose
Capsules, Suspension, and Tablets
Adult: genital herpes attack-200 mg every 4 hours, 5 times a day for 10 days. Recurrent infections-400 mg 3 times a day or 200 mg 5 times a day for 5 days. Suppressive therapy for chronic herpes-800 mg a day, every day for up to a year. Herpes zoster800 mg 5 times a day for 7-10 days.
Child (age 2 and over): Acyclovir has been given to children in daily doses as high as 36 mg per lb. of body weight without any unusual side effects.
Child (under age 2): not recommended.
If you have kidney disease, your doctor should adjust your dose according to the degree of functional loss.
Ointment: Apply every 3 hours, 6 times a day for 7 days. Apply enough medication to cover all visible skin lesions. About 1/2 in. of ointment should cover about 4 sq. in. of lesions. Your doctor may prescribe a longer course of treatment to prevent the delayed formation of new lesions over the duration of an attack. Begin using ointment at the first sign of an attack.
Overdosage
Overdose of oral acyclovir may lead to kidney damage due to deposits of acyclovir crystals in the kidneys. Other side effects include agitation, seizures, lethargy, and coma. The risk of experiencing toxic side effects from swallowing acyclovir ointment is quite small. In the case of overdose or accidental ingestion, call your poison control center. ALWAYS bring the prescription bottle or container.
Special Information
Use a finger cot or rubber glove when applying acyclovir ointment to protect against inadvertently spreading the virus. Be sure to apply the medication exactly as directed and to completely cover all lesions. Keep affected areas clean and dry. Loose-fitting clothing will reduce possible irritation of a healing lesion. If you skip several doses, or a day or more of treatment, the drug will not exert its maximum effect.
Acyclovir is not a cure for genital herpes. Herpes may be transmitted even if you do not have symptoms of active disease. To avoid giving the condition to a sexual partner, do not have intercourse while visible herpes lesions are present. A condom offers some protection against transmission of the herpes virus, but spermicidal products and diaphragms do not. Acyclovir alone will not prevent herpes transmission.
Initiate therapy at the first sign of symptoms.
Women with genital herpes have an increased risk of cervical cancer. Speak with your doctor about the need for an annual Pap smear.
Call your doctor if acyclovir does not relieve your symptoms, if side effects become severe or intolerable, or if you become pregnant or want to begin breast-feeding. Check with your dentist if you notice swelling or tenderness of the gums.
Avoid exposure to excessive sunlight or sunlamps because of unusual sensitivity caused by oral acyclovir.
Special Populations
Pregnancy/Breast-feeding: Acyclovir crosses into the circulation of the fetus. Animal studies have shown that large doses—up to 125 times the human dose—cause damage to both mother and fetus. While there is no information to indicate that acyclovir affects a human fetus, do not use it during pregnancy unless it is specifically prescribed by your doctor and the possible benefit outweighs the risk.
Acyclovir passes into breast milk in concentrations up to 4 times the concentration in blood, and it has been found in the urine of a nursing infant. Although no side effects have been found in nursing babies, mothers who must take acyclovir should use infant formula.
Seniors: Shingles attacks in people over age 50 tend to be more severe and respond best to acyclovir treatment if the drug is started within 48-72 hours of the appearance of the first rash. Seniors with reduced kidney function should be given a lower dose of oral acyclovir than younger adults.