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Nafcillin-associated granulocytopenia
Southern Medical Journal
|November 1, 1978
Summary
Nafcillin treatment can cause granulocytopenia, a low white blood cell count. This rare side effect typically resolves after stopping nafcillin, suggesting a direct bone marrow toxicity rather than an immune response.
Area of Science:
- Pharmacology
- Hematology
- Toxicology
Background:
- Nafcillin is an antibiotic commonly used to treat bacterial infections.
- Granulocytopenia is a serious adverse effect characterized by a reduction in granulocytes, a type of white blood cell.
Observation:
- Three patients developed granulocytopenia during nafcillin therapy.
- This adverse event is rare, with only three prior reported cases in the literature.
Findings:
- The mechanism appears to be direct bone marrow toxicity, not immunologically mediated.
- Granulocytopenia typically manifests around the third week of nafcillin treatment.
Implications:
- Clinicians should monitor for granulocytopenia in patients receiving nafcillin.
- Prompt discontinuation of nafcillin usually leads to spontaneous recovery of white blood cell counts.