Drug interactions
Labetalol + Saquinavir
Severity: Major
Labetalol 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 labetalol slows AV nodal conduction and heart rate. Together they may raise the risk of conduction abnormalities, bradycardia and arrhythmias, especially in patients with underlying cardiac disease.
What this interaction means in plain words
Labetalol 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: saquinavir prolongs PR/QT while beta blockade slows AV conduction.
What to do
Obtain a baseline ECG and monitor PR and QT intervals and heart rate during co-therapy. Consider an alternative antihypertensive or antiretroviral in patients with conduction disease or 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 Labetalol
- Amifostine + Labetalol Major
- Amiodarone + Labetalol Major
- Atenolol-chlorthalidone + Labetalol Major
- Atenolol + Labetalol Major
- Betaxolol + Labetalol Major
- Bisoprolol + Labetalol Major
Frequently asked questions
Can I take Labetalol with Saquinavir?
MediHelp rates the interaction as major. Labetalol 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 labetalol slows AV nodal conduction and heart rate. Together they may raise the risk of conduction abnormalities, bradycardia and arrhythmias, especially in patients with underlying cardiac disease.
How serious is the interaction between Labetalol 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: Obtain a baseline ECG and monitor PR and QT intervals and heart rate during co-therapy. Consider an alternative antihypertensive or antiretroviral in patients with conduction disease or other QT-prolonging drugs.
What other medicines interact with Labetalol?
MediHelp also lists interactions of Labetalol with, for example, Amifostine, Amiodarone, Atenolol-chlorthalidone. The full list is on the Labetalol page.
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