Drug interactions
Perphenazine + Smoking
Severity: Minor
Perphenazine and Smoking: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Tobacco smoke induces CYP1A2, which can lower concentrations of some antipsychotics. Perphenazine is metabolized mainly by CYP2D6, so the effect is likely small, but smokers may need somewhat higher doses, and stopping smoking could raise levels.
What this interaction means in plain words
Perphenazine and Smoking have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Polycyclic hydrocarbons in smoke induce hepatic CYP1A2, with a modest effect on perphenazine clearance.
What to do
Monitor clinical response and adverse effects when a patient starts or stops smoking and adjust the perphenazine dose accordingly.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Frequently asked questions
Can I take Perphenazine with Smoking?
MediHelp rates the interaction as minor. Perphenazine and Smoking have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Tobacco smoke induces CYP1A2, which can lower concentrations of some antipsychotics. Perphenazine is metabolized mainly by CYP2D6, so the effect is likely small, but smokers may need somewhat higher doses, and stopping smoking could raise levels.
How serious is the interaction between Perphenazine and Smoking?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor clinical response and adverse effects when a patient starts or stops smoking and adjust the perphenazine dose accordingly.
What other medicines interact with Perphenazine?
MediHelp also lists interactions of Perphenazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Perphenazine page.
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