nafcillin (generic name)

It is used to treat certain kinds of bacterial infections
(naf SILL in)
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What is this medicine?

NAFCILLIN (naf SILL in) is a penicillin antibiotic. It is used to treat certain kinds of bacterial infections. It will not work for colds, flu, or other viral infections.

What should I tell my health care provider before I take this medicine?

They need to know if you have any of these conditions:
  • liver disease
  • lung or breathing disease, like asthma
  • an unusual or allergic reaction to nafcillin, penicillins or other antibiotics, foods, dyes, or preservatives
  • pregnant or trying to get pregnant
  • breast-feeding

How should I use this medicine?

This medicine is for infusion into a vein or injection into a muscle. It is usually given by a health care professional in a hospital or clinic setting.

If you get this medicine at home, you will be taught how to prepare and give this medicine. Use exactly as directed. Take your medicine at regular intervals. Do not take your medicine more often than directed.

It is important that you put your used needles and syringes in a special sharps container. Do not put them in a trash can. If you do not have a sharps container, call your pharmacist or healthcare provider to get one.

Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.

What if I miss a dose?

If you miss a dose, use it as soon as you can. If it is almost time for your next dose, use only that dose. Do not use double or extra doses.

What may interact with this medicine?

Do not take this medicine with any of the following medications:
  • tetracycline antibiotics

This medicine may also interact with the following medications:

  • cyclosporine
  • probenecid
  • warfarin

What should I watch for while using this medicine?

Tell your doctor or healthcare professional if your symptoms do not start to get better or if they get worse.

Do not treat diarrhea with over the counter products. Contact your doctor if you have diarrhea that lasts more than 2 days or if it is severe and watery.

This medicine can interfere with some urine protein tests. If you use such tests, talk with your health care professional.

What side effects may I notice from receiving this medicine?

Side effects that you should report to your doctor or health care professional as soon as possible:
  • allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
  • breathing problems
  • dark urine
  • discolored tongue
  • fever or chills
  • redness, blistering, peeling or loosening of the skin, including inside the mouth
  • seizures
  • trouble passing urine or change in the amount of urine
  • unusual bleeding or bruising
  • unusually weak or tired

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

  • diarrhea
  • headache
  • nausea, vomiting
  • pain, swelling, or irritation at site where injected
  • sore mouth
  • stomach upset

Where should I keep my medicine?

Keep out of the reach of children.

You will be instructed on how to store this medicine. Throw away any unused medicine after the expiration date on the label.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Last Updated: July 08, 2009
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