Drug interactions
Dimenhydrinate + Lemborexant
Severity: Moderate
Dimenhydrinate and Lemborexant: 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 lemborexant is an orexin receptor antagonist used for insomnia. Taken together they can produce additive drowsiness, impaired alertness and next-day psychomotor impairment, raising the risk of falls and accidents.
What this interaction means in plain words
Dimenhydrinate and Lemborexant 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; Lemborexant belongs to Central Nervous System.
Why it happens
Additive central nervous system depression through H1 antagonism and orexin receptor blockade.
What to do
Avoid routine concurrent use of dimenhydrinate with lemborexant at bedtime, and counsel patients not to drive or perform hazardous tasks if both are taken. Reduce doses or choose a non-sedating antiemetic if combined therapy is unavoidable.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Dimenhydrinate and Lemborexant, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Dimenhydrinate
Other interactions of Lemborexant
Frequently asked questions
Can I take Dimenhydrinate with Lemborexant?
MediHelp rates the interaction as moderate. Dimenhydrinate and Lemborexant 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 lemborexant is an orexin receptor antagonist used for insomnia. Taken together they can produce additive drowsiness, impaired alertness and next-day psychomotor impairment, raising the risk of falls and accidents.
How serious is the interaction between Dimenhydrinate and Lemborexant?
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 routine concurrent use of dimenhydrinate with lemborexant at bedtime, and counsel patients not to drive or perform hazardous tasks if both are taken. Reduce doses or choose a non-sedating antiemetic if combined therapy is unavoidable.
What other medicines interact with Dimenhydrinate?
MediHelp also lists interactions of Dimenhydrinate with, for example, Belladonna and opium, Brexanolone, Calcium / magnesium / potassium / sodium oxybates. The full list is on the Dimenhydrinate page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
