Drug interactions
Isoflurane + Phenylephrine po
Severity: Minor
Isoflurane and Phenylephrine po: minor 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 has sympathomimetic effects that could raise blood pressure, and isoflurane sensitizes the myocardium to catecholamines. At usual oral decongestant doses the effect is modest, but arrhythmia or hypertension is possible.
What this interaction means in plain words
Isoflurane and Phenylephrine po have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Alpha-adrenergic vasoconstriction combined with volatile anesthetic myocardial sensitization to catecholamines.
What to do
Monitor blood pressure and the ECG during anesthesia. Avoid additional sympathomimetics where possible.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Isoflurane
Frequently asked questions
Can I take Isoflurane with Phenylephrine po?
MediHelp rates the interaction as minor. Isoflurane and Phenylephrine po have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Oral phenylephrine has sympathomimetic effects that could raise blood pressure, and isoflurane sensitizes the myocardium to catecholamines. At usual oral decongestant doses the effect is modest, but arrhythmia or hypertension is possible.
How serious is the interaction between Isoflurane and Phenylephrine po?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and the ECG during anesthesia. Avoid additional sympathomimetics where possible.
What other medicines interact with Isoflurane?
MediHelp also lists interactions of Isoflurane with, for example, Adrenaline-articaine, Amisulpride, Arsenic trioxide. The full list is on the Isoflurane page.
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