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Elevated Clozapine Level Following Acute Infection in a Patient with Schizophrenia: a Case Report
J Y K Poon1, D Y Y Tang1, B W M Siu1
1Castle Peak Hospital, Hong Kong.
Summary
An acute infection may increase clozapine levels in patients with schizophrenia. This case highlights the importance of monitoring antipsychotic levels during illness.
Area of Science:
- Psychiatry
- Clinical Pharmacology
Background:
- Schizophrenia is a chronic mental disorder requiring long-term treatment, often with antipsychotic medications like clozapine.
- Clozapine is an effective but potentially toxic medication requiring therapeutic drug monitoring.
Observation:
- A 58-year-old Chinese male patient with schizophrenia presented with symptoms suggestive of an acute infection.
- The patient was on a stable dose of clozapine, but presented with an elevated clozapine serum level.
Findings:
- The elevated clozapine level was suspected to be a consequence of the acute infection.
- Infections can alter drug metabolism and clearance, potentially leading to increased serum concentrations of certain medications.
Implications:
- This case underscores the need for vigilant monitoring of clozapine levels in patients with schizophrenia, especially during intercurrent illnesses.
- Clinicians should consider potential drug-drug-gene interactions and physiological changes during infection that may affect clozapine pharmacokinetics.
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