Drug interactions
Mexiletine + Smoking
Severity: Moderate
Mexiletine and Smoking: moderate 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 and increases mexiletine clearance, lowering levels in smokers. Stopping smoking can cause levels to rise.
What this interaction means in plain words
Mexiletine and Smoking can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Polycyclic hydrocarbons in smoke induce CYP1A2, enhancing mexiletine metabolism.
What to do
Monitor response and mexiletine levels in smokers, as higher doses may be needed. Reduce the dose and watch for toxicity if the patient quits smoking.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Mexiletine
- Fezolinetant + Mexiletine Contraindicated
- Mexiletine + Pimozide Contraindicated
- Alosetron + Mexiletine Major
- Amiodarone + Mexiletine Major
- Clozapine + Mexiletine Major
- Cobicistat + Mexiletine Major
Frequently asked questions
Can I take Mexiletine with Smoking?
MediHelp rates the interaction as moderate. Mexiletine and Smoking can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Tobacco smoke induces CYP1A2 and increases mexiletine clearance, lowering levels in smokers. Stopping smoking can cause levels to rise.
How serious is the interaction between Mexiletine and Smoking?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor response and mexiletine levels in smokers, as higher doses may be needed. Reduce the dose and watch for toxicity if the patient quits smoking.
What other medicines interact with Mexiletine?
MediHelp also lists interactions of Mexiletine with, for example, Fezolinetant, Pimozide, Alosetron. The full list is on the Mexiletine page.
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