Definition: An acid-stable semisynthetic penicillin derived from 6-aminopenicillanic acid; it has a broader spectrum of antimicrobial action than penicillin G, inhibits the growth of gram-positive and gram-negative bacteria, and is not resistant to penicillinase; also available as ampicillin sodium and ampicillin trihydrate.
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Examples: glitazone, GI cocktail, etc.
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