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Like other semisynthetic penicillins, methicillin exhibits an antibacterial effect similar to that of benzylpenicillin. The main difference between methicillin and benzylpenicillin is that it is not inactivated by the enzyme penicillinase, and therefore it is effective with respect to agents producing this enzyme (staphylococci). It is used for infections caused by benzylpenicillin-resistant staphylococci (septicemia, pneumonia, empyemia, osteomyelitis, abscesses, infected wounds, and others). Synonyms of this drug are cinopenil, celbenin, staphcillin, and others.

Nafcillin: Nafcillin, [2S-(2a,5a,6^)]-3,3-dimethyl-7-oxo-6-(2-ethoxy-1-naphthamido)-4-thia-1-azabicyclo[3.2.0]-heptan-2-carboxylic acid (32.1.1.4), is synthesized by acylating 6-APA with 2-ethoxy-1-naphthoic acid chloride in the presence of triethylamine [18-20].

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