Cloxacillin is an antibiotic medication used to treat a broad range of bacterial infections. Some synonyms for cloxacillin include penicillinase-resistant penicillin, which is a type of penicillin that is resistant to the enzyme penicillinase produced by some bacteria. Another synonym is dicloxacillin, which is a derivative of cloxacillin and has similar properties and uses. Methicillin is also closely related and works in a similar way to cloxacillin but is less commonly used due to the development of antibiotic-resistant strains of bacteria. Additionally, oxacillin and nafcillin are other synonyms used interchangeably with cloxacillin as they all belong to the same class of antibiotics known as penicillinase-resistant penicillins.