What are some penicillinase resistant anitibiotic agents?

Penicillinase. This enzyme provides one mechanism of resistance to penicillin derivatives by bacteria. Any antibiotic not in the class of the early penicillins may be susceptible. In the penicillin groups oxacillin, nafcillin, methicillin and their cogeners are all effective against penicillinase producing strains of bacteria.