Active Ingredient

Erythromycin

Erythromycin is a type of antibiotic used to treat various bacterial infections. It is often prescribed when patients are allergic to penicillin or for infections that are resistant to other antibiotics.

This medication helps stop the growth of bacteria, making it effective in treating infections in different parts of the body.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Erythromycin Brands

Ilosone

Strengths 250 mg, 500 mg

Erythromycin

Strengths 250mg, 500mg

Erythromycin Uses

Erythromycin is used to treat a variety of bacterial infections. Some common conditions it may help with include:

Respiratory tract infections
Skin infections
Ear infections
Urinary tract infections
Stomach and intestinal infections

How Erythromycin Works

Erythromycin works by inhibiting the growth of bacteria. It does this by interfering with their ability to produce essential proteins needed for their survival.

As a macrolide antibiotic, it binds to the bacterial ribosome, preventing the synthesis of proteins crucial for bacterial growth.

This action helps in reducing the infection and alleviating symptoms.

Common side effects of Erythromycin

Not everyone experiences side effects with erythromycin, and many of them are mild and temporary. Common side effects include:

Nausea
Vomiting
Diarrhea
Stomach pain
Loss of appetite
Dizziness
Skin rash

If you experience serious or persistent symptoms, it is important to contact your doctor.

Take erythromycin with food to reduce stomach upset.
Avoid consuming large amounts of alcohol while taking this medication.
Inform your doctor about any other medications you are taking to avoid interactions.
Do not use erythromycin if you have a history of liver problems without consulting a doctor.
Report any signs of an allergic reaction, such as difficulty breathing or swelling, to a healthcare professional immediately.

Always consult your doctor for personalized medical advice and before making any changes to your treatment plan.

Frequently Asked Questions

What is erythromycin used for?

Erythromycin is used to treat various bacterial infections, including those affecting the respiratory tract, skin, and ears.

How quickly does erythromycin work?

The time it takes for erythromycin to work can vary, but you may start to see improvements in symptoms within a few days of starting treatment.

Can I drink alcohol while taking erythromycin?

It’s advisable to limit alcohol intake while taking erythromycin to avoid potential interactions and increased side effects.

Are there any foods I should avoid while taking erythromycin?

Erythromycin can be taken with food to help reduce stomach upset, but avoid grapefruit juice as it can interfere with the medication.

What should I do if I miss a dose of erythromycin?

If you miss a dose, take it as soon as you remember. If it’s almost time for your next dose, skip the missed dose and continue with your regular schedule.