Drug interactions
Phenylephrine + Pindolol
Severity: Moderate
Phenylephrine and Pindolol: 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
Blocking beta-receptors with pindolol leaves the alpha-mediated vasoconstriction of phenylephrine unopposed, and the reflex slowing of heart rate may be exaggerated. This can produce a marked rise in blood pressure with reflex bradycardia, although it is uncommon at usual doses.
What this interaction means in plain words
Phenylephrine and Pindolol 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-blockade removes beta2-mediated vasodilation, leaving unopposed alpha-adrenergic vasoconstriction.
What to do
Monitor blood pressure and heart rate when phenylephrine is given systemically to patients on pindolol. Use the lowest effective phenylephrine dose, and consider alternatives to 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
Frequently asked questions
Can I take Phenylephrine with Pindolol?
MediHelp rates the interaction as moderate. Phenylephrine and Pindolol 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. Blocking beta-receptors with pindolol leaves the alpha-mediated vasoconstriction of phenylephrine unopposed, and the reflex slowing of heart rate may be exaggerated. This can produce a marked rise in blood pressure with reflex bradycardia, although it is uncommon at usual doses.
How serious is the interaction between Phenylephrine and Pindolol?
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 phenylephrine is given systemically to patients on pindolol. Use the lowest effective phenylephrine dose, and consider alternatives to 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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