Warnings/Precautions

Do not use Erythromycin if:

you are allergic to any ingredient in Erythromycin;
you are taking astemizole, cisapride, cyclosporine, diltiazem, dofetilide, ergot alkaloids (e.g., ergotamine), HIV protease inhibitors (e.g., ritonavir), imidazoles (e.g., ketoconazole), pimozide, QT prolonging agents (e.g., quinidine, sotalol), quinolones (e.g., ciprofloxacin), streptogramins (e.g., quinupristin/dalfopristin), sumatriptan, terfenadine, or verapamil.
Contact your doctor or health care provider right away if any of these apply to you.

Some medical conditions may interact with Erythromycin . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
if you are pregnant, planning to become pregnant, or are breast-feeding
if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
if you have allergies to medicines, foods, or other substances
if you have diarrhea or a stomach or intestinal infection
if you have a history of kidney or liver disease, heart problems, fast or irregular heartbeat, myasthenia gravis, or the blood disorder porphyria


Some MEDICINES MAY INTERACT with Erythromycin . Tell your health care provider if you are taking any other medicines, especially any of the following:
Efavirenz or rifampin because they may decrease Erythromycin 's effectiveness
Arsenic, cimetidine,diltiazem,dofetilide,HIV protease inhibitors (eg, ritonavir), imidazoles (eg, ketoconazole), pimozide,QT-prolonging agents (eg, quinidine, sotalol), quinolones (eg, ciprofloxacin), streptogramins (eg, quinupristin/dalfopristin ), or verapamil because side effects, such as heart toxicity or irregular heartbeat, may occur
Anticoagulants (eg, warfarin), aldosterone blockers (eg, spironolactone), alfentanil, arsenic, astemizole, benzodiazepines (eg, alprazolam), bromocriptine, buspirone, carbamazepine, cilostazol, cisapride, clozapine, corticosteroids (eg, hydrocortisone), cyclosporine, digitoxin, digoxin, disopyramide, ergot alkaloids (eg, ergotamine), felodipine, H1 antagonists (eg, diphenhydramine), HMG-CoA reductase inhibitors (eg, lovastatin), imatinib, macrolide immunosuppressants (eg, tacrolimus), meglitinide antidiabetics (eg, repaglinide), midazolam, phosphodiesterase type 5 inhibitors (eg, sildenafil), pimozide, QT-prolonging agents (eg, quinidine, sotalol), quinolones (eg, ciprofloxacin), rifampin, serotonin reuptake inhibitors (eg, fluoxetine), sumatriptan, theophyllines, tricyclic antidepressants (eg, amitriptyline), valproic acid, or vinca alkaloids (eg, vincristine) because the risk of their side effects may increased by Erythromycin.