Drug interactions
Encorafenib + Promethazine
Severity: Major
Encorafenib 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 encorafenib may lead to a significant reduction in the QTc interval, which can potentially result in arrhythmias. Caution is advised when these medications are prescribed together due to the risk of altered cardiac conduction.
What this interaction means in plain words
Encorafenib 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.
Encorafenib belongs to Oncology; Promethazine belongs to Respiratory.
Why it happens
Both drugs influence cardiac repolarization, leading to a decrease in the QTc interval, although the exact mechanisms by which they interact are not fully understood.
What to do
Patients receiving this combination should be monitored closely for any signs of cardiac irregularities. Consider alternative therapies if possible to mitigate the risk of adverse effects.
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
Other interactions of Encorafenib
Frequently asked questions
Can I take Encorafenib with Promethazine?
MediHelp rates the interaction as major. Encorafenib 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 encorafenib may lead to a significant reduction in the QTc interval, which can potentially result in arrhythmias. Caution is advised when these medications are prescribed together due to the risk of altered cardiac conduction.
How serious is the interaction between Encorafenib 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 this combination should be monitored closely for any signs of cardiac irregularities. Consider alternative therapies if possible to mitigate the risk of adverse effects.
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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