MARK SYKES / SCIENCE PHOTO LIBRARY MARK SYKES / SCIENCE PHOTO LIBRARY
Erythromycin antibiotic pills spilling from a bottle. Erythromycin is a macrolide antibiotic drug that is used as a replacement for people who are allergic to penicillin. It works by preventing the bacteria from producing proteins they need to survive. These tablets are commonly used to treat bronchitis, diphtheria, pertussis (whooping cough), pneumonia and venereal disease.
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