Drug interactions
Esmolol + Phenoxybenzamine
Severity: Moderate
Esmolol and Phenoxybenzamine: moderate 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
Phenoxybenzamine causes irreversible alpha blockade and marked vasodilation, and adding a beta-blocker can enhance hypotension. Beta-blockade must be introduced only after adequate alpha blockade, as in pheochromocytoma management, to avoid unopposed alpha stimulation.
What this interaction means in plain words
Esmolol and Phenoxybenzamine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive hypotensive effects from alpha-adrenergic and beta-adrenergic blockade.
What to do
Start beta-blocker only after alpha blockade is established and titrate esmolol while monitoring blood pressure and heart rate.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Esmolol
- Acebutolol + Esmolol Major
- Amifostine + Esmolol Major
- Amiodarone + Esmolol Major
- Celiprolol + Esmolol Major
- Diltiazem + Esmolol Major
- Epinephrine racemic + Esmolol Major
Frequently asked questions
Can I take Esmolol with Phenoxybenzamine?
MediHelp rates the interaction as moderate. Esmolol and Phenoxybenzamine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Phenoxybenzamine causes irreversible alpha blockade and marked vasodilation, and adding a beta-blocker can enhance hypotension. Beta-blockade must be introduced only after adequate alpha blockade, as in pheochromocytoma management, to avoid unopposed alpha stimulation.
How serious is the interaction between Esmolol and Phenoxybenzamine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Start beta-blocker only after alpha blockade is established and titrate esmolol while monitoring blood pressure and heart rate.
What other medicines interact with Esmolol?
MediHelp also lists interactions of Esmolol with, for example, Acebutolol, Amifostine, Amiodarone. The full list is on the Esmolol page.
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