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Drug-induced pure red cell aplasia
1Department of Pharmacy Practice, Southwestern Oklahoma State University, Weatherford, USA.
Pharmacotherapy
|November 1, 1996
Summary
Pure red cell aplasia (PRCA) is a rare disorder. Phenytoin, azathioprine, and isoniazid are confirmed drug causes of PRCA, requiring consideration in patients with selective erythrocyte aplasia.
Area of Science:
- Hematology
- Clinical Pharmacology
Background:
- Pure red cell aplasia (PRCA) is an uncommon hematologic disorder.
- PRCA is characterized by absent erythroblasts in normal bone marrow.
- It can be autoimmune, congenital, or acquired due to various factors including drugs.
Purpose of the Study:
- To identify drugs with sufficient evidence of causality in drug-induced PRCA.
- To evaluate the strength of evidence for drug-induced PRCA based on established criteria.
Main Methods:
- Literature review focusing on drug-induced PRCA.
- Inclusion criteria: at least five reported patients, reports from three separate investigators, and probable causality or better using an assessment scale.
- Analysis of causality for implicated drugs.
Main Results:
- Phenytoin, azathioprine, and isoniazid met the criteria for causality in PRCA.
- These three drugs are documented causes of PRCA.
- Limited data exists on the mechanisms of drug-induced PRCA.
Conclusions:
- Phenytoin, azathioprine, and isoniazid are confirmed causative agents of PRCA.
- These drugs should be considered in the differential diagnosis of selective erythrocyte aplasia.
- Further research into the mechanisms of drug-induced PRCA is warranted.