Drug interactions
Dimenhydrinate + Quetiapine
Severity: Moderate
Dimenhydrinate and Quetiapine: 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 with anticholinergic activity and quetiapine is also sedating and anticholinergic through its metabolite. Taken together they can cause excessive drowsiness, impaired psychomotor performance and anticholinergic effects such as confusion or constipation.
What this interaction means in plain words
Dimenhydrinate and Quetiapine 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; Quetiapine belongs to Central Nervous System.
Why it happens
Additive CNS depression and anticholinergic effects from H1 antagonism and muscarinic blockade.
What to do
Advise patients to avoid driving or hazardous tasks and limit dimenhydrinate to occasional low doses. Be particularly cautious in elderly patients, and consider a non-sedating antiemetic.
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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Dimenhydrinate with Quetiapine?
MediHelp rates the interaction as moderate. Dimenhydrinate and Quetiapine 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 with anticholinergic activity and quetiapine is also sedating and anticholinergic through its metabolite. Taken together they can cause excessive drowsiness, impaired psychomotor performance and anticholinergic effects such as confusion or constipation.
How serious is the interaction between Dimenhydrinate and Quetiapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise patients to avoid driving or hazardous tasks and limit dimenhydrinate to occasional low doses. Be particularly cautious in elderly patients, and consider a non-sedating antiemetic.
What other medicines interact with Quetiapine?
MediHelp also lists interactions of Quetiapine with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Quetiapine page.
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