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penicillin vs. amoxicillin

[ pen-uh-sil-in ]
  1. any of several antibiotics of low toxicity, produced naturally by molds of the genus Penicillium and also semisynthetically, having a bactericidal action on many susceptible Gram-positive or Gram-negative cocci and bacilli, some also being effective against certain spirochetes.
[ am-ok-suh-sil-in, uh-mok- ]
  1. a semisynthetic penicillin, C18H19N3O5S, taken orally as a broad-spectrum antibiotic.

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