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Related Experiment Videos

Omeprazole-induced leukopenia. A case report.

P Odou1, P Martin, S Membré

  • 1Laboratoire de Pharmacie Clinique, Faculté des Sciences Pharmaceutiques et Biologiques, Lille, France. podou@nordnet.fr

Journal of Clinical Pharmacy and Therapeutics
|December 3, 1999
PubMed
Summary

Omeprazole, used for ulcers and reflux, may cause leukopenia (low white blood cell count). An in vitro test confirmed omeprazole-induced cytotoxicity in a patient, suggesting a link to this adverse drug reaction.

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Area of Science:

  • Pharmacology
  • Immunology
  • Hematology

Background:

  • Omeprazole, a proton pump inhibitor, has been available since 1989 for treating peptic ulcers, erosive reflux esophagitis, and Zollinger-Ellison syndrome.
  • While effective, omeprazole has been linked to adverse reactions like hemolytic anemia and acute interstitial nephritis.
  • Recent reports suggest omeprazole may induce autoimmune syndromes.

Observation:

  • A 37-year-old female patient developed leukopenia (low white blood cell count) after initiating omeprazole treatment for pneumonia.
  • Leukocyte counts decreased significantly, reaching a nadir of 2.1x10^9/L total white cells and <0.75x10^9/L neutrophils.
  • The patient's condition was observed in an intensive care unit setting due to acute pulmonary insufficiency.

Findings:

Related Experiment Videos

  • An in vitro cytotoxicity test demonstrated that omeprazole induced a toxic effect on patient neutrophils.
  • This cytotoxic effect was specific to the presence of both patient serum and omeprazole.
  • The reaction appeared to be complement-dependent, as heating the serum reduced the omeprazole-induced toxicity.

    • Implications:

    • This case report provides evidence suggesting a direct association between omeprazole use and the development of leukopenia.
    • The findings highlight the importance of monitoring blood counts in patients receiving omeprazole, especially those with pre-existing conditions or on prolonged therapy.
    • Further research may elucidate the precise mechanisms of omeprazole-induced immunotoxicity and guide clinical management of related adverse events.