Drug interactions
Doxylamine + Quazepam
Severity: Major
Doxylamine and Quazepam: major interaction.
Last updated Sources: US FDA label
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
Quazepam is a benzodiazepine hypnotic, and doxylamine adds sedative effects. The combination increases risk of next-day impairment, falls and respiratory depression.
What this interaction means in plain words
Doxylamine and Quazepam can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive CNS depression through GABA-A potentiation and central H1 antagonism.
What to do
Avoid combining with doxylamine sleep aids. If unavoidable, use the lowest doses and monitor for oversedation.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Doxylamine
Frequently asked questions
Can I take Doxylamine with Quazepam?
MediHelp rates the interaction as major. Doxylamine and Quazepam can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Quazepam is a benzodiazepine hypnotic, and doxylamine adds sedative effects. The combination increases risk of next-day impairment, falls and respiratory depression.
How serious is the interaction between Doxylamine and Quazepam?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining with doxylamine sleep aids. If unavoidable, use the lowest doses and monitor for oversedation.
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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