Drug interactions
Quetiapine + Trospium chloride
Severity: Moderate
Quetiapine and Trospium chloride: 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
Quetiapine and its metabolite norquetiapine have anticholinergic activity, so adding trospium can intensify dry mouth, constipation, urinary retention, blurred vision and cognitive effects. Older patients are especially vulnerable to confusion and delirium. Clinically important pharmacokinetic effects on quetiapine absorption are not well established.
What this interaction means in plain words
Quetiapine and Trospium chloride 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.
Why it happens
Additive peripheral and central antimuscarinic effects.
What to do
Monitor for anticholinergic adverse effects, particularly constipation, urinary retention and confusion in older adults. Consider an alternative bladder agent if the burden becomes significant.
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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Frequently asked questions
Can I take Quetiapine with Trospium chloride?
MediHelp rates the interaction as moderate. Quetiapine and Trospium chloride 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. Quetiapine and its metabolite norquetiapine have anticholinergic activity, so adding trospium can intensify dry mouth, constipation, urinary retention, blurred vision and cognitive effects. Older patients are especially vulnerable to confusion and delirium. Clinically important pharmacokinetic effects on quetiapine absorption are not well established.
How serious is the interaction between Quetiapine and Trospium chloride?
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, particularly constipation, urinary retention and confusion in older adults. Consider an alternative bladder agent if the burden becomes significant.
What other medicines interact with Quetiapine?
MediHelp also lists interactions of Quetiapine with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Quetiapine page.
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