Drug interactions
Dimenhydrinate + Thioridazine
Severity: Moderate
Dimenhydrinate and Thioridazine: 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, anticholinergic antihistamine, and thioridazine shares these properties. Together they can cause excess drowsiness, confusion, dry mouth, constipation and urinary retention. The risk is highest in older patients.
What this interaction means in plain words
Dimenhydrinate and Thioridazine 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; Thioridazine belongs to Central Nervous System.
Why it happens
Additive H1 antagonism and muscarinic blockade.
What to do
Use a non-sedating alternative when feasible. If both are needed, monitor for oversedation and anticholinergic effects.
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 Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Dimenhydrinate with Thioridazine?
MediHelp rates the interaction as moderate. Dimenhydrinate and Thioridazine 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, anticholinergic antihistamine, and thioridazine shares these properties. Together they can cause excess drowsiness, confusion, dry mouth, constipation and urinary retention. The risk is highest in older patients.
How serious is the interaction between Dimenhydrinate and Thioridazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use a non-sedating alternative when feasible. If both are needed, monitor for oversedation and anticholinergic effects.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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