Drug interactions
Olanzapine + Trospium
Severity: Moderate
Olanzapine and Trospium: 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
Olanzapine has moderate muscarinic blocking activity, so combining it with trospium increases the anticholinergic burden. Constipation, dry mouth, urinary retention, tachycardia and confusion may be more likely, and the risk of ileus is raised.
What this interaction means in plain words
Olanzapine and Trospium 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; Trospium belongs to Genitourinary.
Why it happens
Additive antimuscarinic pharmacodynamic effects.
What to do
Monitor bowel function, urinary retention and cognition, particularly in older patients. Reduce or stop one of the agents if significant anticholinergic effects appear.
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 Trospium
- Clozapine + Trospium Major
- Pramlintide + Trospium Major
- Thioridazine + Trospium Major
- Trihexyphenidyl + Trospium Major
- Aclidinium + Trospium Moderate
- Amantadine + Trospium Moderate
Other interactions of Olanzapine
Frequently asked questions
Can I take Olanzapine with Trospium?
MediHelp rates the interaction as moderate. Olanzapine and Trospium 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 has moderate muscarinic blocking activity, so combining it with trospium increases the anticholinergic burden. Constipation, dry mouth, urinary retention, tachycardia and confusion may be more likely, and the risk of ileus is raised.
How serious is the interaction between Olanzapine and Trospium?
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 bowel function, urinary retention and cognition, particularly in older patients. Reduce or stop one of the agents if significant anticholinergic effects appear.
What other medicines interact with Trospium?
MediHelp also lists interactions of Trospium with, for example, Clozapine, Pramlintide, Thioridazine. The full list is on the Trospium page.
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