Nafcillin
Chemical compound From Wikipedia, the free encyclopedia
Chemical compound From Wikipedia, the free encyclopedia
Nafcillin sodium is a narrow-spectrum[1] beta-lactam antibiotic[2] 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.
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AHFS/Drugs.com | Monograph |
MedlinePlus | a685019 |
Routes of administration | IM, IV |
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Pharmacokinetic data | |
Protein binding | 90% |
Metabolism | <30% hepatic |
Elimination half-life | 0.5 hours |
Excretion | Biliary and renal |
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ECHA InfoCard | 100.005.174 |
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Formula | C21H22N2O5S |
Molar mass | 414.48 g·mol−1 |
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Nafcillin is considered therapeutically equivalent to oxacillin, although one retrospective study found greater rates of hypokalemia and acute kidney injury in patients taking nafcillin compared to patients taking oxacillin.[3]
Nafcillin is indicated in the treatment of staphylococcal infections, except those caused by MRSA.[4]
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.[5]
As with all penicillins, serious life-threatening allergic reactions can occur. [citation needed]
Milder side-effects include:
There is evidence that nafcillin induces cytochrome P-450 enzymes, specifically CYP2C9. Several drugs with a narrow therapeutic window, such as warfarin and nifedipine, are metabolized by CYP2C9.[7]
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.[citation needed]
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