Drug interactions
Tolterodine + Topiramate
Severity: Minor
Tolterodine 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 CYP3A4 inducer at higher doses and could modestly lower tolterodine exposure. The clinical effect is expected to be small and mostly of concern if bladder symptoms worsen.
What this interaction means in plain words
Tolterodine 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.
Tolterodine belongs to Genitourinary; Topiramate belongs to Central Nervous System.
Why it happens
Weak induction of CYP3A4 by topiramate may increase the metabolism of tolterodine.
What to do
No routine dose change is needed; reassess antimuscarinic efficacy if urinary symptoms worsen after topiramate is started or the dose is increased.
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 Tolterodine
Other interactions of Topiramate
Frequently asked questions
Can I take Tolterodine with Topiramate?
MediHelp rates the interaction as minor. Tolterodine 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 CYP3A4 inducer at higher doses and could modestly lower tolterodine exposure. The clinical effect is expected to be small and mostly of concern if bladder symptoms worsen.
How serious is the interaction between Tolterodine 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 dose change is needed; reassess antimuscarinic efficacy if urinary symptoms worsen after topiramate is started or the dose is increased.
What other medicines interact with Tolterodine?
MediHelp also lists interactions of Tolterodine with, for example, Clarithromycin, Clozapine, Cobicistat. The full list is on the Tolterodine page.
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