Erythromycin is a classic antibiotic that’s been around for decades. If your doctor prescribed it, they probably want to treat a bacterial infection that other meds can’t handle. Below we’ll cover how it works, when it’s the right choice, how to dose it, and what to watch out for.
Erythromycin belongs to the macrolide family. It stops bacteria from making proteins they need to survive, which slows their growth and lets your immune system clear the infection. Because it targets a wide range of bacteria, it’s useful for things like strep throat, chest infections, and certain skin infections.
The drug is absorbed well when taken by mouth, but food can slow it down a bit. If you need fast action, doctors sometimes give it by injection. Keep in mind that it can’t fight viruses, so it won’t help with colds or flu.
Typical scenarios include:
Doctors may also prescribe it for Helicobacter pylori eradication combos, but that’s a more specialized use. Always follow the specific reason your doctor gave you the prescription.
Dosage basics: Adults usually take 250‑500 mg every 6‑12 hours, depending on the infection’s severity. Children get a dose based on weight, often 30‑50 mg per kilogram per day divided into 2‑4 doses. The course can last from 5 days up to two weeks. Don’t stop early just because you feel better; finishing the full course prevents resistance.
How to take it: Swallow tablets or capsules with a full glass of water. If you have stomach upset, you can take it with food, but remember food may lower absorption a bit. If you’re using the liquid form, shake the bottle well and use the measuring device that comes with it.
Side effects to watch for: Most people tolerate erythromycin well, but common complaints include nausea, vomiting, diarrhea, and abdominal cramps. Some folks get a metallic taste in their mouth. Rarely, it can cause liver problems or a serious heart rhythm issue called QT prolongation, especially if you’re on other meds that affect the heart.
If you notice severe stomach pain, yellow skin or eyes, or an irregular heartbeat, call your doctor right away. Also, tell your pharmacist about any other medicines you take – erythromycin can interact with statins, certain anti‑depressants, and many heart drugs.
In summary, erythromycin is a reliable backup antibiotic when penicillin can’t be used. Take it exactly as prescribed, finish the whole course, and keep an eye on any unusual symptoms. When in doubt, ask your doctor or pharmacist for clarification – they’re there to help you stay safe while the drug clears the infection."
