a semisynthetic penicillin, C 18 H 19 N 3 O 5 S, taken orally as a broad-spectrum antibiotic.

amoxicillin a·mox·i·cil·lin (ə-mŏk’sĭ-sĭl’ĭn)
A derivative of ampicillin that is effective against a broad range of gram-negative and gram-positive bacteria.
An antibiotic derived from penicillin, having an antibacterial spectrum of action similar to that of ampicillin. Chemical formula: C16H19N3O5.


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