Aug
13
Entecavir - Guaifenesin - Epoetin - Sildenafil Citrate - Ergoloid Mesylates
August 13, 2009 | Leave a Comment
Generic Name
Entecavir (m-M-ah-veer)
Brand Name Baraclude
Information in this monograph also applies to:
Generic Ingredient: Telbivudine Tyzeka
Type of Drug Antiviral.
Prescribed For
Chronic hepatitis B infection in adults.
General Information
Entecavir is a prescription medicine for adults with chronic hepatitis B virus (HBV) infection in which the virus is multiplying and damaging the liver. Entecavir can reduce the amount of virus in the body, make it harder for new liver cells to be infected by the virus, and improve the general condition of the liver. They work by attacking HBV polymerase, an enzyme essential to the reproduction of the hepatitis B virus inside an infected cell. These drugs are eliminated from the bodj,4kalbe kidney. Telbivudine does not wGCK alg4msl HIV infection and can be taken together with HIV drug therapy. These medicines do not cure HBV or stop you from spreading HBV to others, generally through sexual contact or exposure to infected blood. The HBV virus can live outside the body for one week.
Cautions and Warnings
Do not take these medicines if you are allergic or sensitive to any
of their ingredients.
Entecavir should be used with caution in people who have both HIV and HBV because of possible HIV resistance developing after entecavir is taken.
Severe worsening of HBV has occurred in people who stopped taking this medication.
These drugs can lead to further liver damage. In rare cases, they have been associated with liver failure that resulted in death. The safety of this drug in people who have had a liver transplant is not known.
These drugs are eliminated through the kidneys. People with kidney disease may require lower doses.
Telbivudine has also been associated with lactic acidosis, a condition in which excess lactic acid in the body causes the blood to become acidic. Feeling very weak or tired, experiencing unusual Muscle pain, difficulty breathing, stomach pain with nausea and vomiting, feeling cold—especially in your arms and legs, feeling dizzy or lightheaded, and a fast or irregular heartbeat may be signs of lactic acidosis. It is a medical emergency and must be treated in the hospital. This has happened in some people taking these medications.
Possible Side Effects
Entecavir
♦ Most common: headache, fatigue, dizziness, and nausea.
✓ Less common: diarrhea, upset stomach, vomiting, tiredness, and sleeplessness.
✓ Rare: Rare side effects may affect almost any part of the body. Contact your doctor if you experience any side effect not listed above.
Telbivudine
✓ Most common: upper respiratory infection, latigue, not feeling well, missO2 tenderness or weakness, abdominal pain, nasal irritation, and sore throat.
♦ Common: flu or flu-like symptoms, diarrhea or loose stools, and throat pain.
✓ Less common: fever, joint pain, rash, back pain, dizziness, muscle ache, sleeplessness, and upset stomach.
Drug Interactions low in-
• These drugs do not affect liver enzymes and have a
teraction potential.
• Drugs that affect kidney function may affect blood concentrations of entecavir and telbivudine.
• Other hepatitis B treatments (lamivudine, adefovir, cy-
closporine, and pegylated interferon-alpha 2a) do not affect
either entecavir or telbivudine and are not affected by them. Food Interactions
Take entecavir at least 2 hours after a meal and 2 hours before the next meal. Telbivudine may be taken without regard to food or meals. Usual Dose
Entecavir
Adult and Child (age 16 and over): 0.5-1 mg once daily. People with kidney failure may be treated with as little as 0.05-0.1 mg a day. Child (under age 16): not recommended.
Telbivudine
Adult and Child (age 16 and over): 600 mg once daily. People with moderate to severe kidney failure may be treated with a single 600 mg dose every 2, 3, or 4 days depending on the seriousness of kidney disease.
Child (under age 16): not recommended.
Overdosage
There are no reports of entecavir overdose. People taking single doses up to 40 mg or multiple doses up to 20 mg per day for up to 14 days had no unusual side effects. One person accidentally took an overdose with no consequences. People taking up to 1800 mg a day of telbivudine had no increase in side effects. Overdose victims should be taken to a hospital emergency room for treatment, where dialysis may be necessary to remove the drug from the blood. ALWAYS bring the prescription bottle or container.
Special Information
Call your doctor il you develop muscle aches, pains, or weakness; ‘it your skin or the white part of your eyes turns yellow; if your urine becomes dark; if your bowel movements turn light in color; if you don’t feeling like eating food for several days or longer; if you become nauseous; or if you have lower stomach pain. These can be signs of a serious liver problem called hepatotoxicity, which has occurred in some people taking these medications.
Your hepatitis B may get worse or become very serious if you stop taking these medications. Do not stop taking them or change your daily dose without talking to your doctor.
If you forget to take your daily entecavir dose, take it as soon as you remember but do not take a double dose. Call your doctor if you forget to take 2 or more doses in a row.
Entecavir oral solution is a ready-to-use product and should not be mixed with water or any other liquid product. Each bottle of the oral solution comes with a dosing spoon that is calibrated in 1 -mL increments, up to 10 mL. Hold the spoon upright and gradually fill it to the mark next to the prescribed dose. Drink the liquid directly from the dosing spoon. Your pharmacist can help you properly measure your medication dose. Rinse the dosing spoon with water after each daily dose and allow it to air dry.
Special Populations
Pregnancy/Breast-feeding: Animal studies of entecavir revealed slowed development of the skeleton. Animal studies of telbivudine did not reveal any effects on the developing fetus. However, it is not known if either medicine is safe to use during pregnancy or if it helps prevent the hepatitis B virus from passing on to a developing fetus. If your doctor considers entecavir or telbivudine crucial for you, potential benefits must be carefully weighed against their risks. A data bank has been established to collect information from doctors on pregnant women who do take these medicines.
These medicines may pass into breast milk. Nursing mothers who must take these drugs should use infant formula.
Seniors: Dosage reduction may be needed in seniors because of normal declines in kidney function.
Brand Name
Entex PSE
Generic Ingredients
Guaifenesin + Pseudoephedrine Hydrochloride M
Other Brand Names
Anatuss LA Coldmist Jr.
Aquatab D Dosepack Coldmist LA
Coldmist Congess Jr.
Congess SR Nasabid
Congestac Nasabid-SR
Deconsal LA Nasatab LA
D-Feda 11 PanMist
Durasal U PanMist-Jr.
Duratuss AM/PM PanMist LA
Dynex Profen 11
Endal-SR Pseudovent
Guaimax-D Sudal 60/500
Guaipax PSE SudaI120/600
Guaitab Sudal SR
Guaituss PE Syn-RX
Guai-Vent PSE Touro LA
losal El Tuss-LA
Maxifed V-Dec-M
Maxifed G Versacaps
Med-RX Zephrex
Miraphen PSE Zephrex LA
The information in this profile also applies to the following drugs:
Generic Ingredients: Guaifenesin + Ephedrine Hydrochloride 19 Broncholate Bronkaid
Generic Ingredients: Guaifenesin + Phenylephrine Hydrochloride 91
Deconsal Il PhenaVent
Deconsal Pediatric PhenaVent D
Endal PhenaVent LA
Entex LA PhenaVent PED
Liquibid D Rescon GG
Liquibid-D 1200 Sinupan
Liquibid-PD Sinuvent PE
Type of Drug
Decongestant and expectorant combination.
Prescribed For
Cold or allergy and for nasal congestion, runny nose and cough associated with other upper respiratory conditions.
General Information
The decongestant ingredient in Entex PSE, pseudoephedrine, dramatically reduces congestion and stuffiness. The decongestant ingredients ephedrine and phenylephrine act similarly. The expectorant, guaifenesin, is used to help loosen thick mucus that may contribute to chest congestion; the effectiveness of guaifenesin and other expectorants has not been established. There are other drugs on the market using this same general formula—an expectorant plus a decongestant—but they use different decongestant ingredients or a combination of decongestants plus guaifenesin. Nothing cures a cold or allergy, but Entex PSE may provide relief from symptoms.
Cautions and Warnings
Do not take Entex PSE if you are allergic or sensitive to any of its ingredients.
Entex PSE may cause anxiety or nervousness or interfere with sleep.
Do not use Entex PSE if you have ventricular tachycardia (quickened heartrate), or hypertension (high blood pressure).
Entex PSE should be used with extreme caution in those with heart disease, other heart rhythm disorders, thyroid disease, diabetes, glaucoma, stomach ulcer, urinary blockage, or a prostate condition.
Entex PSE should not be used over extended periods of time to treat persistent or chronic cough especially one that may be caused by cigarette smoking, asthma, or emphysema.
Possible Side Effects
Mritl common: anxiety, restlessness, sleeplessness, tension, excitation, dizziness, drowsiness, and headache.
♦ Less common: nausea, vomiting, upset stomach, low blood pressure, heart palpitations, chest pain, rapid or slow heartbeat, abnormal heart rhythms, irritability, euphoria (feeling Possible Side Effects (continued)
“high”), eye irritation and tearing, hysterical reaction, appetite loss, kidney stones, urinary difficulties in men with a prostate condition, weakness, loss of facial color, and breathing difficulties.
Drug Interactions
• Entex PSE should be avoided if you are taking a monoamine oxidase inhibitor (MAGI) antidepressant for depression or hypertension because the MAGI may cause a very rapid rise in blood pressure or increase side effects such as dry mouth or nose, blurred vision, and abnormal heart rhythms.
• The decongestant in Entex PSE may interfere with bloodpressure-lowering medication.
Food Interactions
Take Entex PSE with food if it upsets your stomach.
Usual Dose
Adult and Child (age 12 and over): 1 tablet or capsule twice a day or 2 tsp. of liquid 4 times a day.
Child (age 6-11):1/2-1 tablet or 1 capsule twice a day or 1 tsp. of liquid 4 times a day.
Overdosage
Most cases of overdose are not severe. Symptoms include sedation, sleepiness, increased sweating, and increased blood pressure. Hallucinations, convulsions, nervous system depression, and breathing difficulties are more prominent in older adults. Most cases of overdose are not severe. Induce vomiting with ipecac syrup—available at any pharmacy. Call your local poison control center or a hospital emergency room before doing this. If you lseey, treatment. ALWAYS bring the prescription bottle or container.
-SIDt’dial Information
Call your doctor if your side effects are severe or gradually become intolerable.
If you forget 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. Do not take a double dose.
Special Populations
Pregnancy/Breast-feeding: Women who are or might be pregnant should avoid Entex PSE. When your doctor considers this drug crucial, its potential benefits must be carefully weighed
against its risks.
The decongestant in Entex PSE may pass into breast milk. Nursing mothers who must take Entex PSE should consider using in-
fant formula.
Seniors: Seniors are more sensitive to the effects of Entex PSE.
Generic Name
Epoetin (EE-poh-eh-tin)
Brand Names Epogen
Type of Drug
Red-blood-cell growth stimulator.
Prescribed For
Anemia; may also be used for reducing the need for blood or redblood-cell transfusions.
General Information
Epoetin is a natural hormone that stimulates the bone marrow to produce red blood cells. It is used for anemia that does not respond to iron supplements. In most cases of anemia, there are plenty of red blood cells circulating, but they lack iron. People who need epoetin do not have enough red blood cells. Epoetin stimulates the production of new red blood cells to carry needed oxygen.
Cautions and Warnings
Do not use epoetin if you are allergic or sensitive to albumin or products manufactured from animal cells.
People with urtvaRtmliked high blood pressure should not use epoetin.
Some people with chronic kidney failure and severe anemia should not take epoetin. Epoetin is not a replacement for emergency blood transfusion.
Epoetin is not intended for anemia caused by folate or iron deficiency, hemolysis, or gastrointestinal bleeding.
Procrit People using epoetin may require anticoagulant medicine to prevent blood clotting during treatment. Tell your doctor it you have any blood-clotting disorders.
In rare cases, people taking epoetin may have seizures. Avoid driving or any other activities where a sudden seizure could be dangerous. Do not take epoetin if you have a history of seizures or strokes.
Epoetin should be avoided in patients with blood cancers such as lymphoma, because it can act as a growth factor for the tumor.
If your hemoglobin levels become too high, your chance of heart attack, stroke, heart failure, blood clots, and death is increased. It is important to have your blood tested and adjust dosage of epoetin accordingly throughout treatment.
Possible Side Effects
Side effects reported in studies of epoetin were similar to those reported with an inactive placebo (sugar pill).
♦ Most common: high blood pressure, headache, constipation, diarrhea, nausea, joint pain, fever, fatigue, itching, rash, and difficulty breathing.
✓ Common: swelling, vomiting, chest pain, skin reactions at the site of injection, weakness, dizziness, urinary infections, diarrhea, upset stomach, blood clots, anxiety, tingling in the hands or feet, and trunk pain.
✓ Rare: stroke and heart attack. Contact your doctor if you experience any side effect not listed above.
Food and Drug Interactions None known.
Usual Dose
Adult: starting dose-23-69 units per 1b. of body weight 3 times a week by intravenous or subcutaneous injection. Final dose is based on response and need. Surgery patients take 138 units per lb. for 10 days before Surgery or 276 units once a week for 3 weeks before surgery and another dose on the day of surgery. Dialysis patients take epoetin once a week.
Child (under age 12): 23 units per lb. of body weight 3 times a week by intravenous or subcutaneous injection. Final dose is based on response and need.
Child (under 1 month): not recommended.
Overdosage
Little is known about the effects of epoetin overdose. Call your local poison control center or a hospital emergency room for information. If you seek treatment, ALWAYS bring the prescription container.
Special Information
People taking epoetin should have regular blood tests to assure the drug is working well. Your doctor may want to take blood samples twice a week for several weeks and then test your blood regularly.
Epoetin has been used by athletes to enhance physical performance. This is called blood doping and has resulted in several deaths because the percentage of red blood cells in a blood sample can reach hazardous levels.
Epoetin must be stored in a refrigerator.
Most patients will need to take iron supplements with this drug.
This drug can be given by injection under the skin. For more in-
formation on how to properly administer this drug, see page 1242.
Special Populations
Pregnancy/Breast-feeding: Animal studies suggest that epoetin may enter fetal circulation. When this drug is considered crucial by your doctor its potential benefits must be carefully weighed against its risks.
It is not known if epoetin passes into breast milk. Nursing mothers who must take it should use infant formula.
Seniors: Seniors may use this product without special precaution.
Type of Drug
Erectile Dysfunction Drugs
Generic Ingredient: Sildenafil Citrate
Viagra Revatio
Generic Ingredient: Tadalafil Cialis
Generic Ingredient: Vardenafil Levitra
Prescribed For
Erectile dysfunction (ED). sildenafil is also prescribed for pulmonary
hypertension.
General Information
The chemical nitric oxide is released in the penis during sexual stimulation. Nitric oxide causes the release of an enzyme called cyclic guanosine monophosphate (cGMP), which increases blood flow into the penis, producing an erection. cGMP is broken down by the enzyme phosphodiesterase type 5 (PDE5). In men with low levels of cGMP, these medicines help achieve and maintain an erection by inhibiting PDE5, thus causing higher levels of cGMP. ED can be the result of nerve, blood vessel, or psychological problems. These drugs, which are effective in about 70% of men, only help when poor blood flow is the cause of the dysfunction. Women have reported some benefit from sildenafil, although it has been widely studied only in men. Vardenafil and tadalafil are intended only for men. These medicines start working in 30-60 minutes and their effects usually last from 2-4 hours, although some have noted an effect for 24 hours or more. Some drug interactions and kidney or liver diseases extend this time. Tadalafil begins working in 30-60 minutes and can remain in the body for more than 2 days, much longer than the other medicines in this group. Low-dose tadalafil may be taken every day for chronic ED.
Pulmonary hypertension, a rare disease in which high pressure in the blood vessels moves from the heart to the lungs, is sometimes treated with sildenafil.
Cautions and Warnings
Do not take ED drugs if you are allergic or sensitive to any of their ingredients.
These medicines lower blood pressure and should be avoided if you have high (greater than 170/100) or low (less than 90/50) blood pressure. Several people have died from a sudden blood-pressure drop after combining erectile dysfunction medications with other medications that can reduce blood pressure.
These Medicines should never be taken by those taking heart medications called nitrates, as fatal reactions have occurred.
People with heart disease may experience heart problems with sildenafil or vardenafil, including a heart attack. These reactions can occur during or shortly after sexual activity.
Avoid these medicines if you have had a heart attack, stroke, or life-threatening abnormal heart rhythms in the past 6 months, or if you have heart failure, unstable angina pectoris, damage to the penis, or a progressive eye disease called retinitis pigmentosa. Blindness is a rare side effect of sildenafil and may be a problem with all of these medications.
People taking sildenafil or vardenafil have experienced difficulties seeing blue or green colors and may see things with a blue tinge surrounding them. This happens because they affect an enzyme in the eye. The effect clears up after the drug passes out of the body.
People with kidney or liver damage retain these medicines in their bodies longer than people whose kidneys and liver function normally. People with kidney or liver problems should always begin with the lowest possible dosage.
People with priapism (painful erection lasting more than 6 hours) or a condition that predisposes them to priapism—such as leukemia, multiple myeloma, or sickle cell anemia—should be cautious about taking these medicines.
Vardenatil and sildenafil should be avoided by people with stomach or bleeding ulcers because its effect on these conditions is not known.
Possible Side Effects
Sildenafil
✓ Most common: headache and flushing.
♦ Less common: upset stomach, stuffy nose, urinary tract infection, diarrhea, rash, dizziness, seizure, anxiety, prolonged and possibly painful erection, double vision, visual changes, bloodshot eyes, burning eyes, swelling in the eye, and blood vessel diseases in the retina.
✓ 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.
Tadalafil
I Most common: headache.
✓ Common: upset stomach. Back pain and muscle aches can develop 12-24 hours after taking tadalafil and go away on their own after 2 days.
Possible Side Effects (continued)
♦ Less common: flushing, nasal congestion, and arm or leg
pain.
♦ Rare-. prolonged or painful erections. Other rare side ef-
fects can occur in almost any part of the body. Contact
your doctor if you experience any side effect not listed
above.
Vardenafil
✓ Most common: headache and flushing.
✓ Less common: upset stomach, sinus infection, flu-like symptoms, dizziness, and nausea.
♦ Rare: prolonged or painful erection. 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
• Do not combine any of these drugs with nitrates (such as nitroglycerin) and other drugs that lower blood pressure. The combination can cause a sudden, rapid drop in blood pressure.
• Do not take vardenafil if you are taking an alpha blocker (such as alfuzosin, doxazosin, prazosin, tamsulosin, or terazosin). Tadalafil may be taken only with tamsulosin. You may take sildenafil at its lowest possible dose with an alpha blocker, but you must separate the doses by at least 4 hours.
• Combining cimetidine and sildenafil leads to a substantial (more than 50%) increase in the amount of sildenafil in the blood.
• Erythromycin, itraconazole, ketoconazole, and protease inhibitors (used to combat HIV) can cause sildenafil blood levels to almost double. Vardenafil levels can increase by 400-1000% when combined with these medicines. It you are taking one of these medicines, do not take more than the %west possible dose of your ED drug. Do not take tadalafil more than once every 3 days if you are also taking one of these medicines.
• Rifampin can be expected to reduce the effect of ED medicines by reducing the amount of drug in the blood. Other
drugs that may reduce the effects of these drugs are carbamazepine, phenobarbital, and phenytoin.
• Dihydrocodeine—a widely used prescription pain reliever—may increase the effects of sildenafil, yielding substantially prolonged erections, sometimes lasting for hours.
• Do not combine sildenafil, tadalafil, and vardenafil. The effects of combining these drugs are not known.
• Do not take vardenafil if you are taking any medicine to treat an abnormal heartbeat, including amiodarone, procainamide, quinidine, and sotalol.
• Combining sildenafil with selective serotonin reuptake inhibitors (SSRIs) or tacrolimus may increase the risk of sildenafil side effects.
• Alcohol adds to the blood-pressure-lowering effects of these medicines.
Food Interactions
Grapefruit juice may increase the amount of these drugs in the blood. Taking sildenafil with a high-fat meal reduces the amount of drug absorbed. Tadalafil and vardenafil may be taken without regard to food or meals.
Usual Dose
Sildenafil
Adult: 50 mg taken about 1 hour before sexual activity. Individual doses can range from 25-100 mg. The maximum dosing frequency is once a day.
Senior: Begin with 25 mg and gradually increase dosage as needed.
Tadalafil
Adult: 10 mg taken about 1 hour before sexual activity. Individual doses can range from 2.5-20 mg. Do not take more than 1 dose of tadalafil a day.
Senior: Begin with 5 mg and gradually increase dosage as needed.
Adult: 10 mg taken about 1 hour before sexual activity. Individual doses can range from 5-20 mg.
Senior: Begin with 5 mg and gradually increase dosage as needed.
Overdosage
sildenafil and tadalafil overdose are likely to produce exaggerated drug side effects. Vardenafil overdose may cause neck pain, muscle aches, or vision changes. Call your local poison control center or hospital emergency room for more information. If you seek treatment, ALWAYS bring the prescription bottle or container.
Special Information
Call your doctor and do not engage in sexual activity if the erection produced by ED drugs is painful or lasts 4 or more hours, or if you experience dizziness, nausea, or chest pain after taking an ED drug. In rare cases, men taking ED drugs have reported a sudden decrease or loss of vision and/or hearing. Call your doctor right away if you experience this adverse side effect.
People who use organic nitrates for gardening or other purposes can experience a severe and dangerous blood pressure drop if they take sildenafil or vardenafil. It is not known how long you have to wait to resume nitrate use.
These drugs do not protect against sexually transmitted diseases.
Special Populations
Pregnancy/Breast-feeding: There is no evidence that sildenafil or vardenafil harm the fetus; however, they are not intended for pregnant women or nursing mothers.
Seniors: Men age 65 and over eliminate these drugs more slowly than younger men and should begin with the lowest possible dosage.
Generic Name
Ergoloid Mesylates (ER-goe-loid
MES-il-ates) (GI
Brand Names Caerimal
Hydergine
Type of Drug Psychotherapeutic agent.
Hydrogenated Ergot Alkaloids
Prescribed For
Age-related decline in mental capacity.
General Information
Ergoloid mesylates are used to treat decreased mental capacity of unknown cause in people over age 60. These drugs should not be used for any condition that is treatable with another drug or that may be reversible. People who respond to ergoloid mesylates are likely to have Alzheimer’s disease or some other cause of dementia. Nobody knows exactly how ergoloid mesylates produce their effect, but they improve the supply of blood to the brain in test animals, reduce their heart rate, and improve muscle tone in blood vessels. Some studies show the drugs to be very effective in relieving mild symptoms of mental impairment, while others find it to be only moderately effective. They are most beneficial in people whose symptoms are due to the effects of high blood pressure in the brain.
Cautions and Warnings
Do not take ergoloid mesylates if you are allergic or sensitive to any of their ingredients or you have psychotic symptoms or psychosis.
Ergoloid mesylates should be used with caution in people with liver disease, low blood pressure, or slow heartbeat.
Possible Side Effects
Ergoloid mesylates do not produce serious side effects.
♦ Common: When taken under the tongue, these drugs may
cause irritation, nausea, or upset stomach. Other side ef-
fects are drowsiness, slow heartbeat, and rash.
Drug Interactions None known.
Food Interactions
Do not eat, drink, or smoke while you have an ergoloid mesylates pill under your tongue.
Usual Dose
Starting dose is 1-2 mg 3 times a day. Increase as needed. Do not exceed 12 mg a day.
Overdosage
Symptoms include blurred vision, dizziness, fainting, flushing, headache, appetite loss, nausea, vomiting, stomach cramps, and stuffy nose. Take the victim to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
The effects of ergoloid mesylates are gradual and frequently not seen for up to 6 months. A 6-month period of treatment with ergoloid mesylates is recommended before your doctor can fully evaluate your response to the drug. Your doctor should periodically reevaluate your condition to determine if ergoloid mesylates treatment is still needed and that it is working for you.
Dissolve sublingual tablets under the tongue. Do not chew or crush them; they are not effective if swallowed whole.
If you forget a dose, skip it and go back to your regular schedule. Do not take a double dose. Call your doctor if you miss 2 or more consecutive doses.
Special Populations
Pregnancy/Breast-feeding: Ergoloid mesylates may interfere with fetal development. When these drugs are considered crucial by your doctor, their potential benefits must be carefully weighed against their risks.
Ergoloid mesylates pass into breast milk. Nursing mothers who must take these drugs should use infant formula.
Seniors: Seniors are more likely to develop side effects, especially hypothermia (low body temperature).
Generic Name
Erythromycin (eh-rith-roe-MYE-sin) 10
Brand Names
Akre-mycin Eryderm
Arr/S Erygel
E-Base Ery-Tab
E-Glades Erythra-derm
E-Mycin PCE Eryc
The information in this profile also applies to all forms of erythromycin:
Generic Ingredient: Erythromycin Estolate LN
Generic Ingredient: Erythromycin Ethylsuccinate E.E.S. Pediamycin EryPed
Generic Ingredients: Erythromycin Ethylsuccinate + Sulfisoxasole
Eryzole Pediazole
Generic Ingredient: Erythromycin Stearate Erythrocin Stearate
Type of Drug Macrolide antibiotic.
Prescribed For
Infections of virtually any part of the body: upper and lower respiratory tract infections; sexually transmitted diseases; urinary tract infections; infections of the mouth, gums, or teeth; and infections of the nose, ears, or sinuses. It is prescribed for acne and may be used for mild to moderate skin infections. Erythromycin is effective against diphtheria and dysentery. It is also prescribed for legionnaires’ disease, rheumatic fever, whooping cough, and bacterial endocarditis. It is prescribed to patients with pelvic inflammatory disease as an alternative to penicillin. The eye ointment is used to prevent newborn gonococcal or chlamydial eye infections.
General Information
Erythromycin and other macrolide antibiotics are either bactericidal (bacteria-killing) or bacteriostatic (inhibiting bacterial growth), depending on the organism in question and amount of antibiotic present. Erythromycin is deactivated by stomach acid, so the tablet form is made to bypass the stomach and dissolve in the intestine.
Since the action of this antibiotic depends on its concentration in the invading bacteria, kk is crucial that you follow your doctor’s ISNVKi10ns regarding the spacing of doses as well as the number of days you must take the medication—otherwise, this antibiotic may be much less effective.
Cautions and Warnings
Do not take erythromycin if you are allergic or sensitive to any of its ingredients or to any macrolide antibiotic.
Erythromycin is excreted primarily through the liver. People with liver disease or damage should consult their doctors. Those on long-term therapy with erythromycin should have periodic blood tests. If you restart erythromycin after having experienced liver damage, it is likely that symptoms will recur within 48 hours.
Erythromycin estolate has occasionally produced liver problems (symptoms include fatigue, nausea, vomiting, abdominal cramps, and fever). If you are susceptible to stomach problems, erythromycin may cause mild to moderate stomach upset; discontinuing the drug will reverse this condition.
Colitis (bowel inflammation) has been associated with all antibiotics and can range from mild to life-threatening (see “Possible Side Effects”),
Possible Side Effects
• Most common: nausea, vomiting, stomach cramps, and diarrhea. Colitis (symptoms include severe abdominal cramps and severe, persistent, and possibly bloody diarrhea) may develop. Side effects of the topical erythromycin include peeling, dryness, itching, and oiliness.
♦ Less common: hairy tongue, itching, irritation of the anal or vaginal region, eye irritation, and skin tenderness. If any of these symptoms appear, call your physician immediately.
♦ Rare: hearing loss—which reverses itself after the drug is stopped and occurs most often in people with liver and kidney problems—and abnormal heart rhythms. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
• Antacids may slightly affect the release of erythromycin from your body. This effect is not considered important.
• Do not combine erythromycin with astemizole or terfenadine.
• Erythromycin may slow the breakdown of carbamazepine (an anticonvulsant prescribed for seizures). Avoid this combination.
• Mixing erythromycin with rifabutin or rifampin can interfere with the antibiotic’s effect and increase the risk of intestinal side effects.
• Do not combine erythromycin and pimozide. Two people died after combining pimozide and a macrolide antibiotic.
• Erythromycin may neutralize penicillin. It may also neutralize the antibiotics lincomycin and clindamycin.
• Erythromycin interferes with the elimination of theophylline
from the body, possibly leading to theophylline overdose.
• Mixing erythromycin with a statin cholesterol-lowering drug increases the risk of developing a potentially fatal condition involving severe muscle pain and destruction.
• Do not mix erythromycin with sparfloxacin, ketoconazole, itraconazole, fluconazole, diltiazem, verapamil, troleandomycin, mibefradil, nefazodone, or clarithromycin. These mixtures can lead to severe, possibly fatal, abnormal heart rhythms. Grepafloxacin (another fluoroquinolone) should only be mixed with erythromycin in hospitalized patients whose hearts can be monitored during treatment.
• Combining erythromycin and alfentanil (an injectable pain reliever), bromocriptine, buspirone, digoxin, disopyramide, ergotamine, cyclosporine, methylprednisolone (a corticosteroid), tacrolimus, vinblastine, or benzodiazepines (such as alprazolam, diazepam, midazolam, and triazolam) increases the risk of drug side effects.
• Erythromycin estolate may increase the liver side effects of other drugs that affect the liver.
• Erythromycin may increase the anticoagulant (blood-thinning) effects of warfarin in people who take it regularly, especially older adults. People taking this combination should be tested regularly.
• Erythromycin may increase the effects of caffeine.
Food Interactions
Grapefruit juice slows the breakdown of erythromycin, increasing the amount of drug in the blood. For optimum effectiveness, take erythromycin base and erythromycin stearate on an empty stomach with a 6-8 oz. glass of water 1 hour before or 2 hours after meals. Other forms of erythromycin can be taken without regard to food or meals.
\huall Dose
Tablet and Suspension
Adult: 250-400 mg every 6 hours, taken 1 hour before meals, or 500 mg every 12 hours. Maximum dose is 4 g a day.
Child: 15-25 mg per lb. of body weight a day in divided doses depending on age, weight, and severity of infection.
Eye Ointment 1/2 inch 2-6 times a day.
Topical Solution: Apply morning and night.
Doses of erythromycin ethylsuccinate are 60% higher due to differences in chemical composition.
Overdosage
Overdose may cause severe side effects, especially nausea, vomiting, stomach cramps, and diarrhea. Mild hearing loss, ringing or buzzing in the ears, or fainting may also occur. Call your local poison control center or a hospital emergency room for more information. ALWAYS bring the prescription bottle or container.
Special Information
Erythromycin is used instead of penicillin for mild to moderate infections in people who are allergic to penicillin. Erythromycin is not the antibiotic of choice for severe infections.
Erythromycin products should be stored at room temperature, except for oral and topical liquids, which should be kept in the refrigerator.
Call your doctor if you develop nausea; vomiting; diarrhea; stomach cramps; severe abdominal pain; rash, itching, or redness; dark or amber-colored urine; yellowing of the skin or whites of the eyes; or any severe or persistent side effect.
If you forget a dose of oral erythromycin, take it as soon as you remember. If it is almost time for your next dose, space the next 2 doses over 4-6 hours, then continue with your regular schedule. Do not take a double dose.
Remember to complete the full course of therapy prescribed even if you feel well before you finish the medication.
Special Populations
Pregnancy/Breast-feeding: Erythromycin passes into the fetal circulation. Erythromycin estolate has caused mild liver inflammation in about 10% of pregnant women who took it and should not be used if you are or might be pregnant. Other forms of erythromycin have been used sale)y without difficulty.
Erythromycin passes into breast milk. Nursing mothers who must take erythromycin should use infant formula.
Seniors: Seniors with liver disease should use caution. Seniors taking high doses of erythromycin may be at an increased risk of hearing loss.