Drug interactions
Thioridazine + Tobacco use
Severity: Minor
Thioridazine and Tobacco use: 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 contributes to phenothiazine metabolism, and may lower thioridazine concentrations. Changes in smoking habits can therefore alter drug effect.
What this interaction means in plain words
Thioridazine and Tobacco use 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 phenothiazine clearance.
What to do
Monitor clinical response and adverse effects when smoking status changes, adjusting the thioridazine dose as required.
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 Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Frequently asked questions
Can I take Thioridazine with Tobacco use?
MediHelp rates the interaction as minor. Thioridazine and Tobacco use 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 contributes to phenothiazine metabolism, and may lower thioridazine concentrations. Changes in smoking habits can therefore alter drug effect.
How serious is the interaction between Thioridazine and Tobacco use?
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 smoking status changes, adjusting the thioridazine dose as required.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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