Drug interactions
Dimenhydrinate + Risperidone
Severity: Moderate
Dimenhydrinate and Risperidone: 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 is a sedating antihistamine, and combining it with risperidone can increase drowsiness and reduce alertness. Additive anticholinergic effects may also cause confusion, dry mouth and constipation, especially in elderly patients.
What this interaction means in plain words
Dimenhydrinate and Risperidone 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; Risperidone belongs to Central Nervous System.
Why it happens
Additive CNS depression and anticholinergic effects from H1 and muscarinic blockade.
What to do
Counsel the patient to avoid driving and alcohol while taking both. Use the lowest effective dimenhydrinate dose and monitor older adults for 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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Dimenhydrinate with Risperidone?
MediHelp rates the interaction as moderate. Dimenhydrinate and Risperidone 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 is a sedating antihistamine, and combining it with risperidone can increase drowsiness and reduce alertness. Additive anticholinergic effects may also cause confusion, dry mouth and constipation, especially in elderly patients.
How serious is the interaction between Dimenhydrinate and Risperidone?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Counsel the patient to avoid driving and alcohol while taking both. Use the lowest effective dimenhydrinate dose and monitor older adults for confusion.
What other medicines interact with Risperidone?
MediHelp also lists interactions of Risperidone with, for example, Ibutilide, Vandetanib, Adagrasib. The full list is on the Risperidone page.
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