Drug interactions
Diazepam intranasal + Doxylamine
Severity: Moderate
Diazepam intranasal and Doxylamine: 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
Diazepam is a benzodiazepine and doxylamine is a sedating antihistamine. Together they can cause marked sedation, impaired coordination and respiratory depression, which is relevant after a seizure rescue dose.
What this interaction means in plain words
Diazepam intranasal and Doxylamine 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.
Why it happens
Additive CNS depression from GABA-A potentiation and central H1 receptor blockade.
What to do
Avoid regular doxylamine use around diazepam dosing, and monitor sedation and breathing after a rescue dose. Counsel against driving and alcohol.
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 Doxylamine
Frequently asked questions
Can I take Diazepam intranasal with Doxylamine?
MediHelp rates the interaction as moderate. Diazepam intranasal and Doxylamine 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. Diazepam is a benzodiazepine and doxylamine is a sedating antihistamine. Together they can cause marked sedation, impaired coordination and respiratory depression, which is relevant after a seizure rescue dose.
How serious is the interaction between Diazepam intranasal and Doxylamine?
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 regular doxylamine use around diazepam dosing, and monitor sedation and breathing after a rescue dose. Counsel against driving and alcohol.
What other medicines interact with Doxylamine?
MediHelp also lists interactions of Doxylamine with, for example, Belladonna and opium, Benzhydrocodone / acetaminophen, Brexanolone. The full list is on the Doxylamine page.
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