Drug interactions
Morphine + Topiramate
Severity: Moderate
Morphine 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
Both drugs can cause drowsiness and cognitive slowing, so combined use may produce additive CNS depression. Topiramate also causes confusion and psychomotor slowing that can add to opioid effects. Respiratory depression is less pronounced than with sedative hypnotics but is possible.
What this interaction means in plain words
Morphine 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.
Morphine belongs to Musculoskeletal; Topiramate belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic CNS depressant effects.
What to do
Counsel patients about sedation and avoid driving or hazardous tasks until response is known. Titrate slowly and reduce the opioid dose if excessive sedation occurs.
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 Morphine
- Alvimopan + Morphine Contraindicated
- Isocarboxazid + Morphine Contraindicated
- Morphine + Olanzapine / samidorphan Contraindicated
- Morphine + Phenelzine Contraindicated
- Morphine + Tranylcypromine Contraindicated
- Alfentanil + Morphine Major
Other interactions of Topiramate
Frequently asked questions
Can I take Morphine with Topiramate?
MediHelp rates the interaction as moderate. Morphine 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. Both drugs can cause drowsiness and cognitive slowing, so combined use may produce additive CNS depression. Topiramate also causes confusion and psychomotor slowing that can add to opioid effects. Respiratory depression is less pronounced than with sedative hypnotics but is possible.
How serious is the interaction between Morphine 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: Counsel patients about sedation and avoid driving or hazardous tasks until response is known. Titrate slowly and reduce the opioid dose if excessive sedation occurs.
What other medicines interact with Morphine?
MediHelp also lists interactions of Morphine with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Morphine page.
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