Drug interactions
Buprenorphine transdermal + Perphenazine
Severity: Major
Buprenorphine transdermal and Perphenazine: major interaction.
Last updated Sources: Health Canada product monograph
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
Combining an opioid with a sedating phenothiazine increases the risk of profound sedation, respiratory depression and coma. Both agents can also prolong the QT interval, and transdermal buprenorphine has its own QT warning.
What this interaction means in plain words
Buprenorphine transdermal and Perphenazine 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, plus additive QT prolongation.
What to do
Use the lowest effective doses and monitor sedation, respiratory rate and QTc. Avoid other CNS depressants and correct hypokalemia or hypomagnesemia.
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 Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Frequently asked questions
Can I take Buprenorphine transdermal with Perphenazine?
MediHelp rates the interaction as major. Buprenorphine transdermal and Perphenazine 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. Combining an opioid with a sedating phenothiazine increases the risk of profound sedation, respiratory depression and coma. Both agents can also prolong the QT interval, and transdermal buprenorphine has its own QT warning.
How serious is the interaction between Buprenorphine transdermal and Perphenazine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective doses and monitor sedation, respiratory rate and QTc. Avoid other CNS depressants and correct hypokalemia or hypomagnesemia.
What other medicines interact with Perphenazine?
MediHelp also lists interactions of Perphenazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Perphenazine page.
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