Drug interactions
Olanzapine + Tolterodine
Severity: Moderate
Olanzapine and Tolterodine: 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
Both drugs have antimuscarinic activity, so combined use can intensify dry mouth, constipation, urinary retention, blurred vision and confusion. Older adults are particularly vulnerable to cognitive effects and cumulative anticholinergic burden.
What this interaction means in plain words
Olanzapine and Tolterodine 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.
Olanzapine belongs to Central Nervous System; Tolterodine belongs to Genitourinary.
Why it happens
Additive anticholinergic (muscarinic antagonist) pharmacodynamic effects.
What to do
Monitor for anticholinergic adverse effects, especially in older patients, and consider a non-anticholinergic bladder agent if symptoms develop.
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 Tolterodine
Other interactions of Olanzapine
Frequently asked questions
Can I take Olanzapine with Tolterodine?
MediHelp rates the interaction as moderate. Olanzapine and Tolterodine 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. Both drugs have antimuscarinic activity, so combined use can intensify dry mouth, constipation, urinary retention, blurred vision and confusion. Older adults are particularly vulnerable to cognitive effects and cumulative anticholinergic burden.
How serious is the interaction between Olanzapine and Tolterodine?
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 for anticholinergic adverse effects, especially in older patients, and consider a non-anticholinergic bladder agent if symptoms develop.
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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