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Erythrocin is an antibiotic (sold under the trade names Erythromycin, E-Mycin, Ethril, Ilosone or Pediamycin) derived from the Streptomyces erythreus actinomycete. It is a prescription-only medication. More information

A doctor will review your order and write you a prescription, if appropriate. This prescription is then forwarded to a pharmacy. The pharmacy will have your medicine delivered to you within one to three working days. Read more about this process here.

Patient Leaflet(s)

What is Erythrocin?

Erythrocin is an antibiotic (sold under the trade names Erythromycin, E-Mycin, Ethril, Ilosone or Pediamycin) derived from the Streptomyces erythreus actinomycete. It is a prescription-only medication. It is effective at killing many types of harmful bacteria. Erythrocin is highly effective at treating many clinical infections including:

  • Upper Respiratory Tract infections;
  • Lower Respiratory Tract infections;
  • Ear infections;
  • Oral infections;
  • Eye infections;
  • Skin and soft tissue infections;
  • Gastrointestinal infections;
  • Sexually transmitted infections.

How to take Erythrocin?

Erythrocin is an oral medication, usually prescribed in the form of a 250 mg coated tablet, although a suspension is available for infants.

Take each tablet just before or with meals to avoid an upset stomach. Swallow each tablet whole with a glass of water.

It is important to take this medicine until the entire course is completed or

until your doctor tells you to stop. Do not suddenly stop taking your medicine, even if you feel better. If you stop the treatment too early, the infection could return.


Typical dosages for adults and children over 8 years:

2g per day in divided dosages for mild to moderate infections. This can be increased to treat severe infection; up to 4g per day.

If you forget to take a dose of Erythrocin, take it as soon as you remember. Do not 'double up' or take more medicine in one day than your doctor advises you to.

Does Erythrocin have any side effects?

As is the case with all medicines, Erythrocin can cause side effects, although not everybody experiences them.

If you notice any of the following symptoms, seek medical help immediately:

  • difficulty breathing;
  • fainting;
  • swelling of the face, lips or throat;
  • skin rashes;
  • severe skin reactions including large fluid-filled blisters,
  • sores and ulcers;
  • ulcers in the mouth and throat, as these may be signs of an
  • allergic reaction.

Contact a doctor immediately if you experience a serious skin reaction: a red, scaly rash with bumps under the skin and blisters.

Other side effects of Erythrocin include:

  • diarrhoea;
  • feeling sick;
  • increase in white blood cells;
  • stomach pains;
  • tinnitus;
  • temporary loss of hearing;
  • liver or gall-bladder problems;
  • chest pains;
  • abnormal heart rhythms;
  • fever;
  • anorexia;
  • confusion;
  • seizures;
  • vertigo;
  • hallucinations;
  • inflammation of the kidneys;
  • low blood pressure.

If you notice any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet.

When is it not safe to take Erythrocin?

You should not receive Erythrocin Tablets if you have been told that you are allergic to erythromycin or any other macrolide antibiotics such as clarithromycin, azithromycin or any of the other ingredients in these tablets. You should also tell your doctor if you are taking any other medications, including over-the-counter products or herbal treatments, such as St.John's Wort, as many substances interact with Erythrocin.

Pregnancy / Breastfeeding / Driving

Erythrocin should be used by women during pregnancy if advised by a doctor.

If you are pregnant or suspect you may be pregnant, or if you are breastfeeding, please consult your doctor before taking this medicine.

There's no formal warning to cease drinking alcohol while taking erythrocin, but research indicates that consuming alcohol may delay the medicine working. It's advisable to stop drinking alcohol or only drink it in moderation while taking erythrocin.