Antibiotics Home > Nafcillin Side Effects

Some of the most commonly reported problems with nafcillin include nausea, vomiting, and diarrhea. However, because nafcillin is an older medication, there are no specific details on how often certain side effects may occur. There are also some potentially reactions to nafcillin, such as bloody diarrhea, seizures, or fever, which require urgent medical treatment.

An Introduction to Side Effects of Nafcillin

Just like any medicine, nafcillin can cause side effects. However, not everyone who receives the drug will have problems. In fact, most people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or are treated easily by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with nafcillin. Your healthcare provider can discuss a more complete list with you.)

Possible Nafcillin Side Effects

For most newer medications, the prescribing information provides highly detailed information on potential side effects, carefully describing the exact percentages of people who developed each side effect during clinical studies.
However, the same is not true for older medications; the prescribing information for most older medications includes only vague information about possible side effects, with no exact percentages. Nafcillin is an older medication, and detailed information about potential side effects is not available. 
Some of the possible bothersome, but not usually dangerous, side effects of nafcillin may include:
  • Nausea
  • Vomiting
  • Diarrhea
  • Canker sores
  • Black, hairy tongue (which is disturbing, but temporary and not dangerous).
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
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