Drug interactions
Orlistat + Zonisamide
Severity: Moderate
Orlistat and Zonisamide: 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
Orlistat reduces fat absorption and has been linked to lower exposure to some antiepileptics, with reports of breakthrough seizures. An effect on zonisamide is theoretical and unproven.
What this interaction means in plain words
Orlistat and Zonisamide 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.
Orlistat belongs to Miscellaneous; Zonisamide belongs to Central Nervous System.
Why it happens
Possible reduced gastrointestinal absorption of the antiepileptic; not well established for zonisamide.
What to do
Monitor seizure control when orlistat is started or stopped. Consider checking a zonisamide level if control worsens.
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 Zonisamide
- Zonisamide + Zuranolone Major
- Acetazolamide + Zonisamide Moderate
- Amisulpride + Zonisamide Moderate
- Amobarbital + Zonisamide Moderate
- Apalutamide + Zonisamide Moderate
- Asenapine transdermal + Zonisamide Moderate
Other interactions of Orlistat
- Cyclosporine + Orlistat Major
- Cyclosporin + Orlistat Major
- Orlistat + Triheptanoin Major
- Amiodarone + Orlistat Moderate
- Beta carotene + Orlistat Moderate
- Carbamazepine + Orlistat Moderate
Frequently asked questions
Can I take Orlistat with Zonisamide?
MediHelp rates the interaction as moderate. Orlistat and Zonisamide 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. Orlistat reduces fat absorption and has been linked to lower exposure to some antiepileptics, with reports of breakthrough seizures. An effect on zonisamide is theoretical and unproven.
How serious is the interaction between Orlistat and Zonisamide?
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 seizure control when orlistat is started or stopped. Consider checking a zonisamide level if control worsens.
What other medicines interact with Zonisamide?
MediHelp also lists interactions of Zonisamide with, for example, Zuranolone, Acetazolamide, Amisulpride. The full list is on the Zonisamide page.
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