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A macrolide antibiotic agent obtained from cultures of a strain of Streptomyces erythraeus found in soil; it is active against Corynebacterium diphtheriae and several other species of Corynebacterium, Group A hemolytic streptococci, Streptococcus pneumoniae, and Bordetella pertussis; Gram-positive bacteria are in general more susceptible to its action than are Gram-negative bacteria, although Neisseria and Brucella are susceptible to its action. Available as the estolate, ethylcarbonate, ethylsuccinate, gluceptate, lactobionate, stearate, and salts; active against Legionella and Mycoplasma pneumoniae. Often used as a substitute antibiotic in penicillin-allergic patients.

- e. estolate a salt of the macrolide antibiotic, e..

- e. glucoheptonate a salt of the macrolide antibiotic, e..

- e. propionate a salt of the macrolide antibiotic, e..

- e. stearate a salt of the macrolide antibiotic, e..

eryth·ro·my·cin i-.rith-rə-'mīs-ən n a broad-spectrum antibiotic C₃₇H₆₇NO₁₃ that is produced by a bacterium of the genus Streptomyces (S. erythreus), resembles penicillin in antibacterial activity, and is effective also against amebas, treponemata, and pinworms also a preparation of the salt (as the estolate or stearate) of erythromycin see ilosone, ilotycin

an antibiotic used to treat infections caused by a wide range of bacteria and other microorganisms. It is administered by mouth or injection or topically. Side-effects are rare and mild, though nausea, vomiting, and diarrhoea occur occasionally. Trade names: Erymax, Erythrocin.