Aug
1
Clarithromycin 250, 500 mg
August 1, 2009 | Leave a Comment
Generic Name: Clarithromycin
Brand Names: Biaxin
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Type of Drug Macrolide antibiotic.
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 is 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 doctor 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 Clarithromycin 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 or tacrolimus may lead to serious side effects.
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.