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DRUG INTERACTIONS: Tell your doctor of all the drugs you may use, (prescription and nonprescription), especially of the following: carbamazepine, cyclosporine, theophylline, certain benzodiazepines (e.g., midazolam, triazolam), warfarin, felodipine (a calcium channel blocker), cisapride, corticosteroids (e.g., prednisone), digoxin, ergotamine-containing medications, sildenafil, certain live vaccines, disopyramide, phenytoin, all other antibiotics, certain "statin" drugs used to treat high cholesterol (e.g., atorvastatin, lovastatin, simvastatin). Other drugs besides erythromycin which may affect the heart rhythm (QTc prolongation in the EKG) include dofetilide, pimozide, quinidine, sotalol, procainamide, and sparfloxacin among others. QTc prolongation can infrequently result in serious, rarely fatal, irregular heartbeats. Consult your doctor or pharmacist for details. Ask for instructions about whether you need to stop any other QTc-prolonging drugs you may be using in order to minimize the risk of this effect. This drug may interfere with the effectiveness of birth control pills. Discuss using other methods of birth control with your doctor. Do not start or stop any medicine without doctor or pharmacist approval.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly. Symptoms of overdose may include stomach cramping, nausea, vomiting, and diarrhea.

Report Problems to the Food and Drug Administration   You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.