Drug interactions
Carbamazepine + Tolterodine
Severity: Minor
Carbamazepine and Tolterodine: 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
Carbamazepine induces CYP3A4 and may lower tolterodine concentrations. Because CYP2D6 is the main pathway and the active 5-hydroxymethyl metabolite is formed by it, the clinical impact is usually limited.
What this interaction means in plain words
Carbamazepine and Tolterodine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Carbamazepine belongs to Central Nervous System; Tolterodine belongs to Genitourinary.
Why it happens
CYP3A4 induction by carbamazepine increases tolterodine metabolism.
What to do
No routine adjustment is needed; reassess bladder symptom control and adjust the dose if response diminishes.
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 Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Tolterodine?
MediHelp rates the interaction as minor. Carbamazepine and Tolterodine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Carbamazepine induces CYP3A4 and may lower tolterodine concentrations. Because CYP2D6 is the main pathway and the active 5-hydroxymethyl metabolite is formed by it, the clinical impact is usually limited.
How serious is the interaction between Carbamazepine and Tolterodine?
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; reassess bladder symptom control and adjust the dose if response diminishes.
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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