Drug interactions
Mexiletine + Ritlecitinib
Severity: Moderate
Mexiletine and Ritlecitinib: 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
Ritlecitinib inhibits CYP1A2 and may increase exposure to CYP1A2 substrates, and mexiletine is partly cleared by this pathway. Higher mexiletine levels could increase neurological and cardiac adverse effects.
What this interaction means in plain words
Mexiletine and Ritlecitinib 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.
Mexiletine belongs to Cardiovascular; Ritlecitinib belongs to Oncology.
Why it happens
Ritlecitinib inhibits CYP1A2, reducing mexiletine clearance.
What to do
Monitor for mexiletine toxicity (tremor, dizziness, nausea) and consider reducing the dose, using plasma levels if available.
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
Other interactions of Ritlecitinib
Frequently asked questions
Can I take Mexiletine with Ritlecitinib?
MediHelp rates the interaction as moderate. Mexiletine and Ritlecitinib 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. Ritlecitinib inhibits CYP1A2 and may increase exposure to CYP1A2 substrates, and mexiletine is partly cleared by this pathway. Higher mexiletine levels could increase neurological and cardiac adverse effects.
How serious is the interaction between Mexiletine and Ritlecitinib?
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 for mexiletine toxicity (tremor, dizziness, nausea) and consider reducing the dose, using plasma levels if available.
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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