CAS NO: 114-07-8
Batch Molecular FormulaC37H67NO13
Batch Molecular Weight733.93 g/mol
Physical AppearanceWhite to off white Solid
Melting point212 to 219° F
StorageStore at RT
Batch Molecular Structure

Erythromycin is an antibiotic medication that is used to treat a variety of bacterial infections. It belongs to a class of antibiotics known as macrolides and works by inhibiting the growth and reproduction of bacteria. Here are some of the common uses of erythromycin:

  1. Respiratory Tract Infections: Erythromycin is often prescribed to treat respiratory infections such as pneumonia, bronchitis, and pertussis (whooping cough).
  2. Skin and Soft Tissue Infections: It can be used to treat bacterial skin infections like cellulitis, impetigo, and erysipelas.
  3. Sexually Transmitted Infections: Erythromycin is sometimes used to treat certain sexually transmitted infections (STIs), such as chlamydia and syphilis, particularly in individuals who are allergic to other antibiotics commonly used for these infections.
  4. Ear Infections: Erythromycin may be used to treat ear infections, particularly in cases where other antibiotics are not appropriate.
  5. Gastrointestinal Infections: It can be prescribed for certain gastrointestinal infections, such as Helicobacter pylori, which is associated with stomach ulcers, and Campylobacter, a common cause of food poisoning.
  6. Prophylaxis: Erythromycin may be used as prophylaxis (preventive treatment) for individuals who are at risk of bacterial endocarditis, a heart infection, before dental and certain medical procedures.

It’s important to take erythromycin as directed by a healthcare provider, complete the full course of treatment even if you start feeling better, and not use it for viral infections such as the common cold or flu, as it is not effective against viruses. Additionally, erythromycin may have potential side effects and may interact with other medications, so it should be used under medical supervision. Always consult with a healthcare professional for proper diagnosis and treatment of bacterial infections.


  • Erythromycin is used to treat certain infections caused by bacteria, such as infections of the respiratory tract, including bronchitis,pneumonia, Legionnaires’ disease (a type of lung infection), and pertussis (whooping cough; a serious infection that can cause severe coughing); diphtheria (a serious infection in the throat); sexually transmitted diseases (STD), including syphilis; and ear, intestine, gynecological, urinary tract, and skin infections. It also is used to prevent recurrent rheumatic fever.
  • Erythromycin is in a class of medications called macrolide antibiotics. It works by stopping the growth of bacteria.Antibiotics such as erythromycin will not work for colds, flu, or other viral infections. Taking antibiotics when they are not needed increases your risk of getting an infection later that resists antibiotic treatment.