Drug interactions
Buprenorphine transdermal + Doxylamine
Severity: Major
Buprenorphine transdermal and Doxylamine: major 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
Concurrent use of a sedating antihistamine with transdermal buprenorphine can cause additive drowsiness and respiratory depression. Because the patch releases drug continuously, effects may persist for a long time.
What this interaction means in plain words
Buprenorphine transdermal and Doxylamine 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 and respiratory depression via opioid receptor agonism and central H1 antagonism.
What to do
Avoid combination where possible; if used, start with the lowest doxylamine dose and monitor sedation and respiration. Counsel against driving and alcohol.
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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Other interactions of Doxylamine
Frequently asked questions
Can I take Buprenorphine transdermal with Doxylamine?
MediHelp rates the interaction as major. Buprenorphine transdermal and Doxylamine 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. Concurrent use of a sedating antihistamine with transdermal buprenorphine can cause additive drowsiness and respiratory depression. Because the patch releases drug continuously, effects may persist for a long time.
How serious is the interaction between Buprenorphine transdermal and Doxylamine?
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 combination where possible; if used, start with the lowest doxylamine dose and monitor sedation and respiration. 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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