Drug interactions
Epinephrine + Phenylephrine po
Severity: Moderate
Epinephrine and Phenylephrine po: 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
Oral phenylephrine is an alpha-1 agonist decongestant that can raise blood pressure. Combined with epinephrine, pressor effects may be additive, with possible hypertension, reflex bradycardia or arrhythmia.
What this interaction means in plain words
Epinephrine and Phenylephrine po 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 alpha-adrenergic vasoconstriction and sympathomimetic stimulation.
What to do
Monitor blood pressure and heart rate when epinephrine is given to patients using oral phenylephrine. Advise hypertensive or cardiac patients to avoid decongestants around epinephrine use.
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 Epinephrine
- Epinephrine + Isocarboxazid Contraindicated
- Epinephrine + Phenelzine Contraindicated
- Epinephrine + Tranylcypromine Contraindicated
- Acebutolol + Epinephrine Major
- Amitriptyline + Epinephrine Major
- Amoxapine + Epinephrine Major
Frequently asked questions
Can I take Epinephrine with Phenylephrine po?
MediHelp rates the interaction as moderate. Epinephrine and Phenylephrine po 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. Oral phenylephrine is an alpha-1 agonist decongestant that can raise blood pressure. Combined with epinephrine, pressor effects may be additive, with possible hypertension, reflex bradycardia or arrhythmia.
How serious is the interaction between Epinephrine and Phenylephrine po?
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 epinephrine is given to patients using oral phenylephrine. Advise hypertensive or cardiac patients to avoid decongestants around epinephrine use.
What other medicines interact with Epinephrine?
MediHelp also lists interactions of Epinephrine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Epinephrine page.
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