Drug interactions
Daridorexant + Diphenhydramine
Severity: Moderate
Daridorexant and Diphenhydramine: 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
Both agents are sedating, and diphenhydramine is widely used as an over-the-counter sleep aid. Taking them together may increase next-day drowsiness and impair psychomotor performance and driving.
What this interaction means in plain words
Daridorexant and Diphenhydramine 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.
Daridorexant belongs to Central Nervous System; Diphenhydramine belongs to Respiratory.
Why it happens
Additive CNS depression from orexin receptor antagonism plus histamine H1 blockade.
What to do
Avoid using diphenhydramine alongside daridorexant for insomnia. If both are needed, use the lowest doses and counsel on daytime impairment.
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 Diphenhydramine
Other interactions of Daridorexant
Frequently asked questions
Can I take Daridorexant with Diphenhydramine?
MediHelp rates the interaction as moderate. Daridorexant and Diphenhydramine 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. Both agents are sedating, and diphenhydramine is widely used as an over-the-counter sleep aid. Taking them together may increase next-day drowsiness and impair psychomotor performance and driving.
How serious is the interaction between Daridorexant and Diphenhydramine?
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 using diphenhydramine alongside daridorexant for insomnia. If both are needed, use the lowest doses and counsel on daytime impairment.
What other medicines interact with Diphenhydramine?
MediHelp also lists interactions of Diphenhydramine with, for example, Alfentanil, Belladonna and opium, Benzhydrocodone / acetaminophen. The full list is on the Diphenhydramine page.
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