Drug interactions
Methadone + Topiramate
Severity: Moderate
Methadone and Topiramate: 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
Topiramate may slightly lower methadone exposure at higher doses through weak CYP3A4 induction, though this effect is usually small. Both drugs also cause CNS depression, with additive sedation and cognitive impairment.
What this interaction means in plain words
Methadone and Topiramate 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.
Methadone belongs to Musculoskeletal; Topiramate belongs to Central Nervous System.
Why it happens
Additive CNS depression, and weak CYP3A4 induction by topiramate that may modestly reduce methadone concentrations.
What to do
Monitor for sedation and cognitive slowing, and for opioid withdrawal symptoms when topiramate is titrated upward. Adjust the methadone dose according to clinical response.
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 Methadone
- Alvimopan + Methadone Contraindicated
- Calcium / magnesium / potassium / sodium oxybates + Methadone Contraindicated
- Droperidol + Methadone Contraindicated
- Ibutilide + Methadone Contraindicated
- Isocarboxazid + Methadone Contraindicated
- Lefamulin + Methadone Contraindicated
Other interactions of Topiramate
Frequently asked questions
Can I take Methadone with Topiramate?
MediHelp rates the interaction as moderate. Methadone and Topiramate 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. Topiramate may slightly lower methadone exposure at higher doses through weak CYP3A4 induction, though this effect is usually small. Both drugs also cause CNS depression, with additive sedation and cognitive impairment.
How serious is the interaction between Methadone and Topiramate?
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 sedation and cognitive slowing, and for opioid withdrawal symptoms when topiramate is titrated upward. Adjust the methadone dose according to clinical response.
What other medicines interact with Methadone?
MediHelp also lists interactions of Methadone with, for example, Alvimopan, Calcium / magnesium / potassium / sodium oxybates, Droperidol. The full list is on the Methadone page.
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