Drug interactions
Belladonna alkaloids + Solifenacin
Severity: Moderate
Belladonna alkaloids 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
Belladonna alkaloids such as atropine and hyoscyamine add to the antimuscarinic effects of solifenacin. This can cause marked dry mouth, constipation, urinary retention, tachycardia and confusion.
What this interaction means in plain words
Belladonna alkaloids 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.
Why it happens
Additive muscarinic receptor antagonism.
What to do
Avoid combining where possible; if both are needed, monitor for urinary retention, constipation and cognitive effects, especially in the elderly.
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
Frequently asked questions
Can I take Belladonna alkaloids with Solifenacin?
MediHelp rates the interaction as moderate. Belladonna alkaloids 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. Belladonna alkaloids such as atropine and hyoscyamine add to the antimuscarinic effects of solifenacin. This can cause marked dry mouth, constipation, urinary retention, tachycardia and confusion.
How serious is the interaction between Belladonna alkaloids 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 combining where possible; if both are needed, monitor for urinary retention, constipation and cognitive effects, especially in the elderly.
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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