Drug interactions
Phenylephrine po + Propranolol
Severity: Moderate
Phenylephrine po 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
With nonselective beta blockade, the alpha-mediated pressor effect of phenylephrine is unopposed, and a hypertensive reaction with reflex bradycardia can occur. This is uncommon at oral decongestant doses but important in hypertensive patients.
What this interaction means in plain words
Phenylephrine po 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.
Why it happens
Beta-2 blockade removes vasodilatory counterbalance to alpha-1 mediated vasoconstriction.
What to do
Monitor blood pressure and avoid oral phenylephrine in patients with uncontrolled hypertension; consider non-pharmacologic congestion relief.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Phenylephrine po and Propranolol, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
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 po with Propranolol?
MediHelp rates the interaction as moderate. Phenylephrine po 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. With nonselective beta blockade, the alpha-mediated pressor effect of phenylephrine is unopposed, and a hypertensive reaction with reflex bradycardia can occur. This is uncommon at oral decongestant doses but important in hypertensive patients.
How serious is the interaction between Phenylephrine po 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 avoid oral phenylephrine in patients with uncontrolled hypertension; consider non-pharmacologic congestion relief.
What other medicines interact with Propranolol?
MediHelp also lists interactions of Propranolol with, for example, Thioridazine, Acebutolol, Adrenaline-articaine. The full list is on the Propranolol page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
