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Occult quinine-induced thrombocytopenia
K Kojouri1, J J Perdue, P J Medina
1College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, USA.
The Journal of the Oklahoma State Medical Association
|December 29, 2000
Summary
Quinine, commonly used for leg cramps, can cause severe thrombocytopenia (low platelets). This case highlights the importance of explicitly asking about all medications, including over-the-counter ones, to diagnose drug-induced conditions.
Area of Science:
- Internal Medicine
- Hematology
- Pharmacology
Background:
- Quinine is widely used for nocturnal leg cramps.
- Patients often do not report self-administered quinine use.
- Thrombocytopenia is a significant adverse drug reaction.
Observation:
- A 68-year-old male presented with severe, recurrent thrombocytopenia and bleeding.
- Initial diagnoses included idiopathic thrombocytopenic purpura and other drug-induced causes.
- The patient initially withheld information about continued quinine use for leg cramps.
Findings:
- Recurrent thrombocytopenia episodes were directly linked to quinine ingestion.
- Quinine-induced thrombocytopenia was confirmed after multiple symptomatic episodes.
- Diagnosis was challenging due to the common use of quinine and patient non-disclosure.
Implications:
- Physicians must inquire explicitly about all medications, including self-prescribed ones like quinine.
- Undiagnosed drug-induced thrombocytopenia can lead to severe bleeding complications.
- Awareness of quinine's potential to cause thrombocytopenia is crucial for patient safety.