Antibiotics Home > Nafcillin

When and How to Use It

Some general 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.
  • 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.

Dosing Information

The dose of nafcillin your healthcare provider recommends will vary, depending on various factors, such as:
  • Your age
  • Your weight (for children)
  • The type and severity of the infection being treated
  • Other medical conditions you may have.
(Click Nafcillin Dosage for more information.)

Side Effects of Nafcillin

Just like any medicine, nafcillin can cause side effects. However, not everyone who uses the drug will experience problems. Most people tolerate it quite well.
If reactions do occur, in most cases, they are mild and either require no treatment or are treated easily by you or your healthcare provider. Serious side effects are less common.
A few of the possible side effects of nafcillin include but are not limited to:
  • Allergic reactions
  • Irritation or inflammation at the IV or injection site.
(Click Nafcillin Side Effects to learn more, including potentially serious side effects you should report immediately to your healthcare provider.)
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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