Drug interactions
Orlistat + Topiramate
Severity: Moderate
Orlistat 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
Orlistat reduces fat absorption and has been reported to lower levels of some antiepileptic drugs, with breakthrough seizures described in case reports with other agents. Topiramate is mostly water soluble and well absorbed, so a significant effect is not established but cannot be excluded.
What this interaction means in plain words
Orlistat 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.
Orlistat belongs to Miscellaneous; Topiramate belongs to Central Nervous System.
Why it happens
Possible reduced gastrointestinal absorption of topiramate; the mechanism is not firmly established.
What to do
Monitor seizure control after starting orlistat in patients with epilepsy. Consider checking clinical response and adjusting the topiramate dose if seizures increase.
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 Topiramate
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 Topiramate?
MediHelp rates the interaction as moderate. Orlistat 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. Orlistat reduces fat absorption and has been reported to lower levels of some antiepileptic drugs, with breakthrough seizures described in case reports with other agents. Topiramate is mostly water soluble and well absorbed, so a significant effect is not established but cannot be excluded.
How serious is the interaction between Orlistat 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 seizure control after starting orlistat in patients with epilepsy. Consider checking clinical response and adjusting the topiramate dose if seizures increase.
What other medicines interact with Topiramate?
MediHelp also lists interactions of Topiramate with, for example, Benzhydrocodone / acetaminophen, Buprenorphine long-acting, Buprenorphine subdermal implant. The full list is on the Topiramate page.
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