Drug interactions
Phenylephrine + Propranolol
Severity: Moderate
Phenylephrine and Propranolol: 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
Nonselective beta-blockade leaves alpha-1 mediated vasoconstriction unopposed and blunts reflex tachycardia, so phenylephrine can cause a marked rise in blood pressure and reflex bradycardia. Hypertensive episodes are uncommon but can be significant.
What this interaction means in plain words
Phenylephrine and Propranolol 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.
Phenylephrine belongs to Respiratory; Propranolol belongs to Cardiovascular.
Why it happens
Nonselective beta-blockade prevents beta-2 vasodilation and cardiac compensation, unmasking alpha-1 pressor effects.
What to do
Monitor blood pressure and heart rate when systemic phenylephrine is used with propranolol. Use the lowest effective phenylephrine dose and avoid oral decongestants in hypertensive patients.
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 Phenylephrine
- Isocarboxazid + Phenylephrine Contraindicated
- Phenelzine + Phenylephrine Contraindicated
- Phenylephrine + Tranylcypromine Contraindicated
- Bromocriptine + Phenylephrine Major
- Cocaine + Phenylephrine Major
- Dihydroergotamine intranasal + Phenylephrine Major
Other interactions of Propranolol
- Propranolol + Thioridazine Contraindicated
- Acebutolol + Propranolol Major
- Adrenaline-articaine + Propranolol Major
- Albuterol + Propranolol Major
- Amifostine + Propranolol Major
- Amiodarone + Propranolol Major
Frequently asked questions
Can I take Phenylephrine with Propranolol?
MediHelp rates the interaction as moderate. Phenylephrine and Propranolol 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. Nonselective beta-blockade leaves alpha-1 mediated vasoconstriction unopposed and blunts reflex tachycardia, so phenylephrine can cause a marked rise in blood pressure and reflex bradycardia. Hypertensive episodes are uncommon but can be significant.
How serious is the interaction between Phenylephrine and Propranolol?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and heart rate when systemic phenylephrine is used with propranolol. Use the lowest effective phenylephrine dose and avoid oral decongestants in hypertensive patients.
What other medicines interact with Phenylephrine?
MediHelp also lists interactions of Phenylephrine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Phenylephrine page.
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