Definition of Antibiotics

npl antibacterial substances derived from fungi and bacteria, exemplified by penicillin. * Later antibiotics such as tetracycline* are active against a wider range of pathogenic organisms, and are also effective orally. Others, such as neomycin* and bacitracin, * are rarely used internally owing to high toxicity, but are effective when applied topically, and skin sensitization is uncommon.

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