Drug interactions
Buprenorphine buccal + Diphenhydramine
Severity: Major
Buprenorphine buccal and Diphenhydramine: 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
Buprenorphine is an opioid, and diphenhydramine is a sedating antihistamine. Together they can cause profound sedation, respiratory depression and impaired psychomotor function.
What this interaction means in plain words
Buprenorphine buccal and Diphenhydramine 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 H1 blockade and mu-opioid partial agonism.
What to do
Avoid the combination if possible, or use the lowest effective doses and monitor for sedation and respiratory depression. Counsel patients not to drive and to avoid 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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Buprenorphine buccal and Diphenhydramine, 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 14 days on the web. No card needed.
Other interactions of Diphenhydramine
Frequently asked questions
Can I take Buprenorphine buccal with Diphenhydramine?
MediHelp rates the interaction as major. Buprenorphine buccal and Diphenhydramine 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. Buprenorphine is an opioid, and diphenhydramine is a sedating antihistamine. Together they can cause profound sedation, respiratory depression and impaired psychomotor function.
How serious is the interaction between Buprenorphine buccal and Diphenhydramine?
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 the combination if possible, or use the lowest effective doses and monitor for sedation and respiratory depression. Counsel patients not to drive and to avoid alcohol.
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.
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.
