Erythrocin
Erythrocin is a brand-name macrolide antibiotic containing erythromycin, used to treat various bacterial infections including respiratory tract infections, skin infections, and certain sexually transmitted infections. It is often prescribed as an alternative for patients allergic to penicillin. The medication is available in multiple formulations including tablets and oral suspension.
Erythrocin is a macrolide antibiotic used to treat bacterial infections, often as a penicillin alternative.
Key facts at a glance
- RxNorm
- 645943
- Generic
- Erythrocin
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Treats respiratory tract infections (such as pneumonia and bronchitis), skin and soft tissue infections, ear infections, and certain sexually transmitted infections like chlamydia. May also be used for prevention of bacterial endocarditis in penicillin-allergic patients.
Erythromycin, the active ingredient in Erythrocin, is a macrolide antibiotic that works by binding to the 50S ribosomal subunit of bacteria, inhibiting protein synthesis and preventing bacterial growth.
Common side effects include gastrointestinal disturbances such as nausea, diarrhea, and abdominal pain. Should be taken with food to reduce stomach upset. Inform your doctor of all medications as erythromycin has multiple drug interactions, particularly affecting drugs metabolized by CYP3A enzymes. Complete the full course of treatment even if symptoms improve.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy