Drug interactions
Buprenorphine long-acting + Promethazine
Severity: Major
Buprenorphine long-acting and Promethazine: 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
The concurrent use of promethazine and long-acting buprenorphine may lead to enhanced sedation and an increased risk of respiratory depression. Additionally, both medications have the potential to affect the QTc interval, which could lead to serious cardiac complications.
What this interaction means in plain words
Buprenorphine long-acting and Promethazine 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
Both drugs can cause sedation through central nervous system depression, and they may also influence cardiac repolarization, contributing to QTc interval prolongation.
What to do
Patients receiving both medications should be monitored closely for signs of excessive sedation and respiratory depression. Consider alternative therapies if possible, especially in patients with pre-existing cardiac conditions or those taking other QT-prolonging drugs.
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 Promethazine
- Cabergoline + Promethazine Contraindicated
- Dopamine + Promethazine Contraindicated
- Ibutilide + Promethazine Contraindicated
- Pimozide + Promethazine Contraindicated
- Promethazine + Thioridazine Contraindicated
- Alfentanil + Promethazine Major
Frequently asked questions
Can I take Buprenorphine long-acting with Promethazine?
MediHelp rates the interaction as major. Buprenorphine long-acting and Promethazine 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. The concurrent use of promethazine and long-acting buprenorphine may lead to enhanced sedation and an increased risk of respiratory depression. Additionally, both medications have the potential to affect the QTc interval, which could lead to serious cardiac complications.
How serious is the interaction between Buprenorphine long-acting and Promethazine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Patients receiving both medications should be monitored closely for signs of excessive sedation and respiratory depression. Consider alternative therapies if possible, especially in patients with pre-existing cardiac conditions or those taking other QT-prolonging drugs.
What other medicines interact with Promethazine?
MediHelp also lists interactions of Promethazine with, for example, Cabergoline, Dopamine, Ibutilide. The full list is on the Promethazine page.
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