Medically reviewed by Jessica Swirble, PharmD
Last updated on March 26, 2025
Drug Information | Side Effects | Use & Dosage | Request an Online Prescription
Erythromycin is an antibiotic medication used to treat bacterial infections in various areas of the body.
Erythromycin is prescribed for the treatment of various bacterial infections, including:
Erythromycin works by inhibiting the growth of bacteria. It does this by interfering with their protein synthesis, ultimately leading to the death of the bacteria.
Erythromycin is available as an oral tablet, capsule, delayed-release capsule, and liquid suspension. It may also be available in ointment and topical gel forms for certain skin conditions. Ophthalmic erythromycin is used for the treatment of bacterial eye infections. The form of erythromycin prescribed will depend on the infection requiring treatment.
The time it takes to notice an improvement in symptoms can vary depending on the type of infection being treated. It's essential to complete the full course of treatment as prescribed by your healthcare provider, even if you start feeling better before the medication is finished.
Erythromycin may also be prescribed off-label for conditions such as acne. It may also be prescribed to prevent heart infections in patients undergoing dental surgery or other procedures. Discuss any alternative uses with your healthcare provider.
Erythromycin is available as an oral tablet, capsule, delayed-release capsule, and liquid suspension. It may also be available in ointment and topical gel forms. Ophthalmic erythromycin is available for bacterial eye infections.
Erythromycin is available under brand names like ERY-C, Ery-Tab, Erythrocin, and PCE. Generic versions of erythromycin are also available.
Erythromycin is available both over-the-counter and via prescription. For systemic infections, you must have a written prescription from a licensed healthcare provider to obtain this medication.
The use of erythromycin has been shown to cause side effects in some patients.
Common mild side effects of erythromycin use include:
More severe side effects include:
Seek medical attention immediately if you experience any severe symptoms while taking erythromycin. If you experience mild side effects that become severe or do not go away after a few days, speak to a healthcare provider right away.
Tell your healthcare provider about any existing medical conditions, allergies, or other medications you are taking before starting treatment with erythromycin. This includes prescription drugs, over-the-counter medications, and dietary supplements, as they may interact with this drug.
Tell your provider if you are taking these medications or supplements:
You should also mention medical conditions such as:
If you are pregnant, planning to become pregnant, or breastfeeding, consult your healthcare provider before using erythromycin to assess potential risks and benefits.
You can follow your regular diet while taking erythromycin. However, until you know how erythromycin affects you, avoid activities requiring mental alertness, such as driving or operating heavy machinery. Erythromycin may cause dizziness or lightheadedness.
Avoid eating grapefruit or drinking grapefruit while taking erythromycin. Grapefruit can increase the effects of erythromycin, leading to more side effects.
Avoid consuming alcohol while taking erythromycin, as it may increase the risk of side effects such as stomach upset and liver toxicity.
Your healthcare provider will provide specific instructions regarding the use of erythromycin with food, beverages, and other medications. It's essential to follow their guidance to ensure the effectiveness of the treatment and minimize the risk of side effects.
If you suspect an overdose of Erythromycin or experience severe symptoms, seek immediate medical attention or contact a poison control center. Symptoms of an overdose may include nausea, vomiting, diarrhea, and abdominal pain. If an individual has collapsed, is having seizures, or is unresponsive, call 9-1-1 immediately.
Erythromycin is available in various forms:
The typical starting dose of erythromycin can vary depending on the type and severity of the infection, the age of the patient, and other medical considerations. It is important to strictly follow your healthcare provider's instructions regarding dosage and administration.
For adults with mild to moderate infections treated orally, the typical starting doses may be:
For children, the typical starting doses may be based on weight and age, usually ranging from:
For topical erythromycin used to treat acne or skin infections, the typical starting dose may involve applying a thin layer of the cream, gel, or ointment to the affected area once or twice daily.
Your healthcare provider will evaluate your medical condition, allergies, and other medications you may be taking to determine the most appropriate dose and formulation for you.
Erythromycin should be taken or applied exactly as directed by your healthcare provider. Do not exceed the recommended dose or duration of treatment without consulting your doctor.
If you have any questions about your dosage, contact your healthcare provider. If you want to talk to a provider right away, book an online doctor appointment on Sesame to discuss your concerns.
If you miss a dose, take it as soon as you remember it. If it's almost time for another dose of erythromycin, skip the missed dose and take your next dose as scheduled. Do not take or apply a double dose of erythromycin.
Do not discontinue or alter your erythromycin dosage without consulting with your healthcare provider. Follow your healthcare provider's instructions regarding dosing and other recommendations for taking erythromycin.
Store erythromycin as directed by your healthcare provider or pharmacist. Proper storage is essential to maintain the medication's effectiveness. Erythromycin should be stored at room temperature, away from excessive heat, light, and moisture.
Keep the medication out of the reach of children and ensure that the container is tightly closed.