Nafcillin Dosage

Given as an injection into a vein (by IV) or a muscle (IM injection), nafcillin is an antibiotic that is administered two to six times a day. The nafcillin dosage your healthcare provider uses will depend on the type and severity of the infection, among other factors. The length of treatment will usually continue for at least two days after signs of the infection are gone.

An Introduction to Dosing With Nafcillin

The dose of nafcillin your healthcare provider recommends will vary, depending on factors such as:
  • Your age
  • Your weight
  • The type and severity of the infection being treated
  • Other medical conditions you may have.
As is always the case, do not adjust your dosage unless your healthcare provider specifically tells you to do so.

What Is the Recommended Nafcillin Dosage for Adults?

The standard dose of nafcillin for mild-to-moderate infections in adults is 500 mg every four to six hours given intravenously (by IV) or intramuscular (IM injection). For severe infections, a higher dosage of 1 gram (1000 mg) every four hours is used.

Nafcillin Dosing Guidelines for Children

The standard recommended dose of nafcillin for children will vary, depending mostly on the child's weight. In general, the standard is 25 mg per kg (about 11.4 mg per lb) given twice daily by intramuscular injection. This dosage should be used for children weighing less than 88 pounds; the usual adult dosage should be used for children who weigh 88 pounds or more.
For premature babies and newborns, the recommended dose is a total of 10 mg per kg (about 4.5 mg per lb) given twice daily by intramuscular injection.

General Information on Receiving Nafcillin

Some considerations to keep in mind during treatment with nafcillin include the following:
  • This medication is given by IV or injected into a muscle two to six times a day.
  • Lower-than-normal doses may be necessary for people with liver or kidney disease.
  • The length of treatment recommended will vary, depending on the type and severity of the infection. Treatment is usually continued for at least two days after all signs and symptoms of the infection are gone.
  • Make sure to finish the prescribed course of this antibiotic, as stopping it too soon can lead to a more serious infection.
  • If you are unsure about anything related to your dosage or nafcillin dosing in general, please talk to your healthcare provider or pharmacist.

Nafcillin Antibiotic Information

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