Drug interactions
Buprenorphine transdermal + Clemastine
Severity: Major
Buprenorphine transdermal and Clemastine: 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
Transdermal buprenorphine provides continuous opioid exposure, and adding a sedating antihistamine can increase drowsiness and impair alertness. Respiratory depression is possible, and the patch effect persists after removal.
What this interaction means in plain words
Buprenorphine transdermal and Clemastine 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 from the partial opioid agonist and the sedating H1 antihistamine.
What to do
Monitor for sedation and slowed breathing, particularly after dose changes, and consider a non-sedating antihistamine. Advise avoiding alcohol and driving until tolerance to the combined effect is established.
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 Clemastine
Frequently asked questions
Can I take Buprenorphine transdermal with Clemastine?
MediHelp rates the interaction as major. Buprenorphine transdermal and Clemastine 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. Transdermal buprenorphine provides continuous opioid exposure, and adding a sedating antihistamine can increase drowsiness and impair alertness. Respiratory depression is possible, and the patch effect persists after removal.
How serious is the interaction between Buprenorphine transdermal and Clemastine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for sedation and slowed breathing, particularly after dose changes, and consider a non-sedating antihistamine. Advise avoiding alcohol and driving until tolerance to the combined effect is established.
What other medicines interact with Clemastine?
MediHelp also lists interactions of Clemastine with, for example, Alfentanil, Benzhydrocodone / acetaminophen, Buprenorphine buccal. The full list is on the Clemastine page.
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