AHFS/Drugs.com Monograph Routes of
administration IM, IV | MedlinePlus a685019 ATC code J01CF06 (WHO) | |
 | ||
Pregnancy
category US: B (No risk in non-human studies) Legal status In general: ℞ (Prescription only) | ||
Nafcillin sodium is a narrow-spectrum beta-lactam antibiotic of the penicillin class. As a beta-lactamase-resistant penicillin, it is used to treat infections caused by Gram-positive bacteria, in particular, species of staphylococci that are resistant to other penicillins.
Contents
Nafcillin is considered therapeutically equivalent to oxacillin, although its safety profile is somewhat different.
Indications
Nafcillin is indicated in the treatment of staphylococcal infections, except those caused by MRSA.
U.S. clinical practice guidelines recommend either nafcillin or oxacillin as the first-line treatment of choice for staphylococcal endocarditis in patients without artificial heart valves.
Side-effects
As with all penicillins, serious life-threatening allergic reactions can occur.
Milder side-effects include:
Interactions
There is evidence that it induces cytochrome P-450 enzymes specifically CYP2C9. Several drugs with a narrow theraputic window, such as warfarin and nifedipine, are metabolized by CYP2C9.
Nafcillin contains salts added as stability media. These added salts could cause edema or fluid accumulation. It would be prudent to avoid this medication if there were a concern for a congestive heart failure or kidney disease.