Nafcillin (injection)

Generic name: nafcillin (injection) [ naf-SIL-in ]
Brand names: Unipen, Nallpen
Dosage forms: injectable powder for injection (1 g; 10 g; 2 g); intravenous solution (1 g/50 mL; 2 g/100 mL)
Drug class:Penicillinase resistant penicillins

Medically reviewed by Drugs.com on Feb 8, 2022. Written by Cerner Multum.

What is nafcillin?

Nafcillin is a penicillin antibiotic is used to treat many different types of infections, especially those caused by staphylococcus bacteria ("staph" infections).

Nafcillin may also be used for purposes not listed in this medication guide.

Warnings

You should not use nafcillin if you are allergic to any penicillin antibiotic.

Before taking this medicine

You should not use this medicine if you are allergic to nafcillin or similar antibiotics, such as:

• amoxicillin (Amoxil, Augmentin, and others);

• ampicillin;

• dicloxacillin;

• oxacillin; or

• penicillin.

Tell your doctor if you have ever had:

• asthma;

• allergies;

• liver disease;

• kidney disease; or

• any type of allergy (especially to antibiotic medicine).

It is not known whe...