Drug interactions
Benztropine + Solifenacin
Severity: Moderate
Benztropine and Solifenacin: 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 agents block muscarinic receptors, so together they raise the risk of constipation, urinary retention, dry mouth, blurred vision, confusion, and heat intolerance. Older patients are particularly susceptible to delirium.
What this interaction means in plain words
Benztropine and Solifenacin 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.
Benztropine belongs to Central Nervous System; Solifenacin belongs to Genitourinary.
Why it happens
Additive antimuscarinic effects.
What to do
Avoid in older or cognitively impaired patients where possible. Otherwise use the lowest effective doses and monitor for urinary retention, constipation, and confusion.
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 Solifenacin
Other interactions of Benztropine
- Benztropine + Memantine-donepezil Major
- Abobotulinumtoxina + Benztropine Moderate
- Amantadine + Benztropine Moderate
- Amitriptyline + Benztropine Moderate
- Amoxapine + Benztropine Moderate
- Atropine iv / + Benztropine Moderate
Frequently asked questions
Can I take Benztropine with Solifenacin?
MediHelp rates the interaction as moderate. Benztropine and Solifenacin 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 agents block muscarinic receptors, so together they raise the risk of constipation, urinary retention, dry mouth, blurred vision, confusion, and heat intolerance. Older patients are particularly susceptible to delirium.
How serious is the interaction between Benztropine and Solifenacin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid in older or cognitively impaired patients where possible. Otherwise use the lowest effective doses and monitor for urinary retention, constipation, and confusion.
What other medicines interact with Solifenacin?
MediHelp also lists interactions of Solifenacin with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Solifenacin page.
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