Nafcillin sodium is primarily used as an antibiotic to treat infections caused by penicillinase-producing staphylococci. It is effective against a range of bacterial infections, including skin and soft tissue infections, respiratory tract infections, and bone and joint infections. The medication is often administered intravenously or intramuscularly to ensure rapid and effective delivery into the bloodstream. In clinical settings, it is particularly valuable for patients who are allergic to penicillin but can tolerate beta-lactam antibiotics. Additionally, nafcillin sodium is sometimes used in combination with other antibiotics to enhance its efficacy or to treat more complex infections. Its ability to resist degradation by bacterial enzymes makes it a reliable choice for combating resistant strains of bacteria.