Erythromycin: What It Treats, How to Use It, and Safety Tips
Erythromycin is a macrolide antibiotic you’ve probably heard of. Doctors use it for some respiratory infections, skin infections, and eye infections. It also comes as a gel or ointment for acne and newborn eye care. This page gives clear, practical info so you know what to expect and when to call your provider.
How erythromycin is used
Oral erythromycin treats throat, sinus, and some lung infections when penicillin isn’t an option. Topical forms help acne. There’s an eye ointment for newborns and for certain bacterial conjunctivitis cases. Dosing depends on the infection: adults often take 250–500 mg every 6–12 hours, but follow your doctor’s instructions. For kids, the dose is weight-based, so don’t guess.
Practical tips for taking it
Want it to work better and give fewer stomach problems? Try taking erythromycin 1 hour before meals or 2 hours after. If you get bad nausea, taking it with food may help—ask your prescriber first. Finish the full course even if you feel better. Stopping early can let bacteria bounce back and become resistant.
Watch for common side effects: nausea, stomach cramps, vomiting, and diarrhea. If you get severe belly pain or bloody stools, contact your doctor right away—this could be a sign of C. difficile infection. Also be alert for sudden heart palpitations, fainting, or severe allergic reactions; those need emergency care.
Erythromycin interacts with a lot of medicines. It can raise levels of drugs like some statins, blood thinners, and certain heart medicines. That raises the risk of side effects, including dangerous heart rhythm changes (QT prolongation). Always tell your prescriber about every medicine and supplement you take.
Resistance is real. In many places, common bacteria are now less sensitive to macrolides. That’s why your doctor may choose a different antibiotic based on local resistance patterns or test results.
If you’re pregnant, breastfeeding, or have liver disease, talk with your clinician before using erythromycin. Some forms have special warnings for pregnancy or liver problems—don’t self-prescribe.
Buying tips: erythromycin usually requires a prescription. If you order online, use a licensed pharmacy with clear contact info, a valid prescription process, and secure payment. Avoid sites offering massive discounts without asking for a prescription. If price is an issue, ask your pharmacist about generics, coupons, or patient assistance programs.
Questions for your doctor: What dose do I need and for how long? Are there safer alternatives for my condition? What side effects should I expect and when should I seek help? Bring up all other medications so they can check for interactions.
Need more details or trustworthy articles on similar antibiotics? Check credible medical sites or ask your healthcare team. Erythromycin can be very effective when used the right way—know the basics and stay safe.
