Drug interactions
Dimenhydrinate + Solifenacin
Severity: Moderate
Dimenhydrinate 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
Dimenhydrinate contains diphenhydramine, which has strong antimuscarinic effects. With solifenacin it can add to dry mouth, constipation, urinary retention, blurred vision and confusion, especially in older patients.
What this interaction means in plain words
Dimenhydrinate 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.
Dimenhydrinate belongs to Respiratory; Solifenacin belongs to Genitourinary.
Why it happens
Additive antimuscarinic (anticholinergic) pharmacodynamic effects.
What to do
Avoid combining in older or cognitively impaired patients and use a non-sedating, non-anticholinergic alternative. If unavoidable, 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 Dimenhydrinate
Frequently asked questions
Can I take Dimenhydrinate with Solifenacin?
MediHelp rates the interaction as moderate. Dimenhydrinate 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. Dimenhydrinate contains diphenhydramine, which has strong antimuscarinic effects. With solifenacin it can add to dry mouth, constipation, urinary retention, blurred vision and confusion, especially in older patients.
How serious is the interaction between Dimenhydrinate 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 in older or cognitively impaired patients and use a non-sedating, non-anticholinergic alternative. If unavoidable, 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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