Erythromycin: uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 5 November 2026

Erythromycin is an older macrolide antibiotic, also used for acne. It belongs to the Antibiotic (other) group. These antibiotics from various families treat specific bacterial infections; they do not work against viruses.

Ask MedDroid about erythromycin →

Drug type — dosing is set by your doctor

Measure	Range
Drug class	Antibiotic (other)
Type	Prescription
Dose	Individual — ask your doctor or pharmacist

What it is used for

Chest and throat infections
Skin infections
Acne (as tablets or as a gel/lotion on the skin)
Whooping cough and some other infections
An alternative for some people allergic to penicillin

Common brand names

India: Erythrocin, Althrocin
Worldwide: Ery-Tab, Erythrocin

Common side effects

Nausea, vomiting or tummy cramps (common)
Diarrhoea
Rash

Before taking it — precautions

Tell your doctor about liver problems
It interacts with many medicines (e.g. some statins, blood thinners, heart and seizure medicines) — list all your medicines
Tell your doctor about heart rhythm problems

When to see a doctor urgently

Severe allergy — swelling or breathing difficulty (urgent)
Fast or irregular heartbeat or fainting (urgent)
Severe or bloody diarrhoea, or yellow eyes/skin

Not a prescription — no dose shown. The right dose of erythromycin depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.

Frequently asked questions

Why does erythromycin upset my stomach?

Erythromycin speeds up gut movement, which commonly causes nausea and cramps. Taking it as directed and with the formulation your doctor advises can help.

Is erythromycin used for acne?

Yes — as a gel or lotion and sometimes as tablets. It is usually combined with another acne treatment to reduce resistance.

Is it safe in pregnancy?

Erythromycin has long been used in pregnancy when an antibiotic is needed, but only take it if your doctor advises.

Ask MedDroid about erythromycin →

Explore more

Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.