Definitions:

1. A penicillinase-resistant form of penicillin used to treat infections caused by penicillin-resistant strains of staphylococci. NOUN
   • Administering nafcillin intravenously ensures its rapid distribution throughout the body to fight infection.
2. An antibiotic belonging to the penicillin class of drugs, used primarily to treat bacterial infections caused by penicillinase-producing staphylococci, making it particularly effective against certain strains of staphylococcus bacteria that have developed resistance to other antibiotics. NOUN
   • Nafcillin's bactericidal action helps eliminate bacteria and prevent the spread of infection.

Synonyms:

• nafcil
• penicillin
• penicillinase-resistant antibiotic