Drug interactions
Isoproterenol + Phenylephrine po
Severity: Moderate
Isoproterenol 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-agonist decongestant that can raise blood pressure, and isoproterenol raises heart rate. Combined use may add to cardiovascular stimulation and arrhythmia risk, though oral systemic effects are modest.
What this interaction means in plain words
Isoproterenol 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 adrenergic stimulation from alpha-1 agonism and beta-agonism.
What to do
Monitor blood pressure and heart rate and avoid decongestants in patients with cardiac disease receiving isoproterenol.
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 Isoproterenol
Frequently asked questions
Can I take Isoproterenol with Phenylephrine po?
MediHelp rates the interaction as moderate. Isoproterenol 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-agonist decongestant that can raise blood pressure, and isoproterenol raises heart rate. Combined use may add to cardiovascular stimulation and arrhythmia risk, though oral systemic effects are modest.
How serious is the interaction between Isoproterenol 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 and avoid decongestants in patients with cardiac disease receiving isoproterenol.
What other medicines interact with Isoproterenol?
MediHelp also lists interactions of Isoproterenol with, for example, Adrenaline-articaine, Bisoprolol, Budesonide-formoterol. The full list is on the Isoproterenol page.
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