Drug interactions
Buprenorphine long-acting + Clemastine
Severity: Major
Buprenorphine long-acting 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
Long-acting injectable buprenorphine gives prolonged opioid exposure, and a sedating antihistamine adds to drowsiness and psychomotor impairment. Respiratory depression is possible and cannot be reversed quickly because of the depot.
What this interaction means in plain words
Buprenorphine long-acting 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
Prefer a non-sedating antihistamine when an antihistamine is needed. If combined, monitor for sedation and respiratory depression and counsel on 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 Clemastine
Frequently asked questions
Can I take Buprenorphine long-acting with Clemastine?
MediHelp rates the interaction as major. Buprenorphine long-acting 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. Long-acting injectable buprenorphine gives prolonged opioid exposure, and a sedating antihistamine adds to drowsiness and psychomotor impairment. Respiratory depression is possible and cannot be reversed quickly because of the depot.
How serious is the interaction between Buprenorphine long-acting 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: Prefer a non-sedating antihistamine when an antihistamine is needed. If combined, monitor for sedation and respiratory depression and counsel on driving and alcohol.
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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