Drug interactions
Cigarette smoking + Fluphenazine
Severity: Minor
Cigarette smoking and Fluphenazine: 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 hepatic CYP1A2, which may lower concentrations of some phenothiazines. Smokers may need higher doses for the same effect, and stopping smoking may cause levels to rise with more side effects. The effect is better documented for other phenothiazines than for fluphenazine.
What this interaction means in plain words
Cigarette smoking and Fluphenazine 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 aromatic hydrocarbons in smoke induce CYP1A2, increasing clearance of some antipsychotics.
What to do
Review clinical response and adverse effects when smoking status changes, and adjust the dose accordingly. Consider therapeutic drug monitoring if available.
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 Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Frequently asked questions
Can I take Cigarette smoking with Fluphenazine?
MediHelp rates the interaction as minor. Cigarette smoking and Fluphenazine 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 hepatic CYP1A2, which may lower concentrations of some phenothiazines. Smokers may need higher doses for the same effect, and stopping smoking may cause levels to rise with more side effects. The effect is better documented for other phenothiazines than for fluphenazine.
How serious is the interaction between Cigarette smoking and Fluphenazine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Review clinical response and adverse effects when smoking status changes, and adjust the dose accordingly. Consider therapeutic drug monitoring if available.
What other medicines interact with Fluphenazine?
MediHelp also lists interactions of Fluphenazine with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Fluphenazine page.
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