Drug interactions
Carvedilol + Saquinavir
Severity: Major
Carvedilol and Saquinavir: 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
Saquinavir can prolong the PR and QT intervals, and carvedilol slows AV conduction. Together they may raise the risk of conduction block and arrhythmia, and saquinavir may also raise carvedilol exposure.
What this interaction means in plain words
Carvedilol and Saquinavir 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 effects on cardiac conduction, plus possible CYP3A4 and P-glycoprotein inhibition by saquinavir increasing carvedilol levels.
What to do
Use an alternative agent if possible; if combined, obtain a baseline ECG and monitor PR interval and heart rate.
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 Carvedilol
Frequently asked questions
Can I take Carvedilol with Saquinavir?
MediHelp rates the interaction as major. Carvedilol and Saquinavir 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. Saquinavir can prolong the PR and QT intervals, and carvedilol slows AV conduction. Together they may raise the risk of conduction block and arrhythmia, and saquinavir may also raise carvedilol exposure.
How serious is the interaction between Carvedilol and Saquinavir?
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 an alternative agent if possible; if combined, obtain a baseline ECG and monitor PR interval and heart rate.
What other medicines interact with Carvedilol?
MediHelp also lists interactions of Carvedilol with, for example, Amifostine, Amiodarone, Arformoterol. The full list is on the Carvedilol page.
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