Clozapine and Smoking: Drug Interaction Guide
Quick answer: This combination requires caution. Clozapine and Smoking can be used together with adjustments and monitoring.
How Clozapine interacts with Smoking
Polycyclic aromatic hydrocarbons in tobacco smoke induce CYP1A2, increasing clearance of clozapine; abrupt smoking cessation rapidly raises plasma clozapine levels.
What you should do
Monitor clozapine plasma levels when smoking status changes and consider reducing dose by 30-50% on cessation to avoid toxicity (sedation, seizures).
Key facts
Severity
Moderate — caution required
Mechanism
Polycyclic aromatic hydrocarbons in tobacco smoke induce CYP1A2, increasing clearance of clozapine; abrupt smoking cessa...
Action
Monitor clozapine plasma levels when smoking status changes and consider reducing dose by 30-50% on cessation to avoid t...
Frequently asked questions
Can I take Clozapine and Smoking together?
With caution. Monitor clozapine plasma levels when smoking status changes and consider reducing dose by 30-50% on cessation to avoid toxicity (sedation, seizures).
What is the severity of this interaction?
The interaction between Clozapine and Smoking is classified as Moderate — caution required. Polycyclic aromatic hydrocarbons in tobacco smoke induce CYP1A2, increasing clearance of clozapine; abrupt smoking cessation rapidly raises plasma clozapine levels.
What should I do if I'm prescribed both?
Monitor clozapine plasma levels when smoking status changes and consider reducing dose by 30-50% on cessation to avoid toxicity (sedation, seizures). Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.