Azithromycin vs. Erythromycin — What's the Difference?

Azithromycin is an antibiotic medication used for the treatment of a number of bacterial infections. This includes middle ear infections, strep throat, pneumonia, traveler's diarrhea, and certain other intestinal infections.

Erythromycin is an antibiotic used for the treatment of a number of bacterial infections. This includes respiratory tract infections, skin infections, chlamydia infections, pelvic inflammatory disease, and syphilis.

A macrolide antibiotic, C38H72N2O12, used to treat a variety of bacterial infections.

An antibiotic, C37H67NO13, obtained from a strain of the actinomycete Saccharopolyspora erythraea and used chiefly to treat infections caused by gram-positive bacteria.

(pharmaceutical drug) A semisynthetic macrolide antibiotic C₃₈H₇₂N₂O₁₂ (trademarks Zithromax, Z-PAK) that is derived from erythromycin and is used especially as an antibacterial agent.

(pharmaceutical drug) A broad-spectrum macrolide antibiotic C₃₇H₆₇NO₁₃ produced by an actinomycete Saccharopolyspora erythraea (formerly Streptomyces erythreus) and similar in its effects to penicillin, administered orally or topically in the treatment of infections caused by Gram-positive bacteria.

An antibiotic (trade name Erythrocin or E-Mycin or Ethril or Ilosone or Pediamycin) obtained from the actinomycete Streptomyces erythreus; effective against many Gram-positive bacteria and some Gram-negative