Drug interactions
Ritonavir + Topiramate
Severity: Minor
Ritonavir and Topiramate: minor 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 is a weak inducer and ritonavir is a strong CYP3A4 inhibitor, so any lowering of ritonavir exposure is unlikely to be clinically relevant. The pair is generally used without problems.
What this interaction means in plain words
Ritonavir and Topiramate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Ritonavir belongs to Anti Virals; Topiramate belongs to Central Nervous System.
Why it happens
Weak CYP3A4 induction by topiramate is overwhelmed by ritonavir inhibition.
What to do
No dose adjustment is needed. Continue routine HIV viral load monitoring.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Topiramate
Other interactions of Ritonavir
- Alfuzosin + Ritonavir Contraindicated
- Amiodarone + Ritonavir Contraindicated
- Avanafil + Ritonavir Contraindicated
- Colchicine + Ritonavir Contraindicated
- Dronedarone + Ritonavir Contraindicated
- Eletriptan + Ritonavir Contraindicated
Frequently asked questions
Can I take Ritonavir with Topiramate?
MediHelp rates the interaction as minor. Ritonavir and Topiramate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Topiramate is a weak inducer and ritonavir is a strong CYP3A4 inhibitor, so any lowering of ritonavir exposure is unlikely to be clinically relevant. The pair is generally used without problems.
How serious is the interaction between Ritonavir and Topiramate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No dose adjustment is needed. Continue routine HIV viral load monitoring.
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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