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Clozapine toxicity associated with smoking cessation: case report
Jennifer L Derenne1, Ross J Baldessarini
1Department of Psychiatry and Neuroscience Program, Harvard Medical School, Boston, Massachusetts, USA. jderenne@partners.org
American Journal of Therapeutics
|September 9, 2005
Summary
Smoking cessation significantly increases clozapine levels, potentially causing toxicity. Patients on clozapine require careful monitoring and dose adjustment when quitting smoking to prevent adverse effects.
Area of Science:
- Pharmacology
- Psychiatry
Background:
- Clozapine is an atypical antipsychotic used for treatment-resistant schizophrenia.
- Smoking is common in patients with psychotic disorders and can affect drug metabolism.
Observation:
- A patient on clozapine (450 mg/d) stopped smoking and rapidly developed anticholinergic side effects.
- Serum clozapine levels were significantly higher after smoking cessation compared to when smoking.
Findings:
- Cigarette smoking markedly increases the clearance of clozapine, reducing its bioavailability.
- Smoking cessation led to a substantial increase in clozapine serum concentration, precipitating toxicity.
Implications:
- Clinicians must anticipate increased clozapine levels upon smoking cessation in patients.
- Dose reduction of clozapine is crucial during smoking cessation to prevent adverse drug reactions and ensure patient safety.