What Is Nafcillin?

Available by prescription only, nafcillin is an antibiotic that is given intravenously (by IV) or injected into a muscle (IM injection) to treat certain types of bacterial infections. Specifically, nafcillin is used when there is a reason to suspect that an infection is caused by bacteria that will be susceptible to the drug. This is often determined by using a culture and sensitivity test.
 
Nafcillin is a penicillinase-resistant, beta-lactam antibiotic and works by stopping bacteria from making cell walls, which eventually causes the bacteria to die. Some of the possible side effects include allergic reactions and irritation at the injection site.
 
(To learn more about what this medication is used for, click Nafcillin. This resource contains a comprehensive overview of this antibiotic, including dosing guidelines, safety precautions, and more.)
 
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