Drug interactions
Erlotinib + Topiramate
Severity: Minor
Erlotinib 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
Erlotinib is a CYP3A4 substrate, and topiramate is a weak inducer that could modestly reduce its exposure. Reduced exposure might theoretically lessen efficacy, but the effect is likely small.
What this interaction means in plain words
Erlotinib 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.
Erlotinib belongs to Oncology; Topiramate belongs to Central Nervous System.
Why it happens
Weak CYP3A4 induction by topiramate may increase erlotinib clearance.
What to do
No routine adjustment is needed. Monitor tumor response and consider an alternative antiseizure drug if efficacy is a concern.
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 Erlotinib
- Amobarbital + Erlotinib Major
- Apalutamide + Erlotinib Major
- Carbamazepine + Erlotinib Major
- Cobicistat + Erlotinib Major
- Darunavir + Erlotinib Major
- Dexlansoprazole + Erlotinib Major
Frequently asked questions
Can I take Erlotinib with Topiramate?
MediHelp rates the interaction as minor. Erlotinib 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. Erlotinib is a CYP3A4 substrate, and topiramate is a weak inducer that could modestly reduce its exposure. Reduced exposure might theoretically lessen efficacy, but the effect is likely small.
How serious is the interaction between Erlotinib 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 routine adjustment is needed. Monitor tumor response and consider an alternative antiseizure drug if efficacy is a concern.
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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