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Indications And Usage Nafcillin Is Indicated In The Treatment Of Infections Caused By Penicillinase-Producing Staphylococci Which Have Demonstrated Susceptibility To The Drug. Culture And Susceptibility Tests Should Be Performed Initially To Determine The Causative Organism And Its Susceptibility To The Drug (see Clinical Pharmacology: Susceptibility Test Methods ). Nafcillin Should Not Be Used In Infections Caused By Organisms Susceptible To Penicillin G. If The Susceptibility Tests Indicate That The Infection Is Due To A Methicillin-Resistant Staphylococcus Sp., Therapy With Nafcillin For Injection, Usp Should Be Discontinued And Alternative Therapy Provided. To Reduce The Development Of Drug-Resistant Bacteria And Maintain The Effectiveness Of Nafcillin For Injection, Usp And Other Antibacterial Drugs, Nafcillin For Injection, Usp Should Be Used Only To Treat Or Prevent Infections That Are Proven Or Strongly Suspected To Be Caused By Susceptible Bacteria. When Culture And Susceptibility Information Are Available, They Should Be Considered In Selecting Or Modifying Antibacterial Therapy. In The Absence Of Such Data, Local Epidemiology And Susceptibility Patterns May Contribute To The Empiric Selection Of Therapy.
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