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Nafcillin
Pronounced naf-SIL-in
Brand names: Nafcil
Type: Penicillin antibiotic (anti-staphylococcal) · All Antibiotics & Infection Medicines
What Nafcillin is used for
- Serious staph infections in hospital
- Heart valve, bone, and bloodstream infections from staph (hospital)
◆ Kidney note
Kidney function is monitored during treatment, as inflammation of the kidneys is a rare side effect.
Common side effects
- Pain or vein irritation at the infusion site
- Diarrhea
- Nausea
- Rash
Important cautions
- True penicillin allergy can be life-threatening — always tell your care team about any past reaction
- Used in hospital with monitoring of blood counts, liver, and kidneys
How it comes
Injection (hospital). This guide lists forms only — it never lists strengths or doses.
Toxicity lists: Nafcillin also appears on Medicines That Can Harm the Kidneys.
Related medicines — Antibiotics & Infection Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.