DRUG REVIEWSecond-generation tetracyclines involve semisynthesis of methacycline compounds with chemical modifications of ring C.These exhibit enhanced pharmacokinetic and pharmacodynamic properties, antimicrobial activity, and decreased toxic effects.Doxycycline is synthesized from the precursor methacycline. 6ederle (later Wyeth) reevaluated the tetracycline derivatives and their actions in the late 1980s.The modification of the Sancycline core ring D positions C7 and C9 led to the development of new tetracyclines that belong to the third generation: Tigecycline is a glycyl derivative of minocycline with a glycine moiety at C9-aminotetracyclines.
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Anuradha K (2025) studied this question.
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