Drug interactions
Oxytocin + Phenylephrine po
Severity: Minor
Oxytocin 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
Oxytocin given together with sympathomimetic vasoconstrictors has been associated with excessive blood pressure elevation. Oral phenylephrine has low and variable bioavailability, so the effect is likely small but could matter in hypertensive or obstetric patients.
What this interaction means in plain words
Oxytocin 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
Additive pressor effects from oxytocin and alpha-adrenergic vasoconstriction.
What to do
Monitor blood pressure if the combination is used in an obstetric or hypertensive patient. Avoid oral decongestants in women with hypertensive disorders of pregnancy.
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 Oxytocin
- Carboprost tromethamine + Oxytocin Major
- Dinoprostone + Oxytocin Major
- Ephedrine + Oxytocin Major
- Fexinidazole + Oxytocin Major
- Givinostat + Oxytocin Major
- Misoprostol + Oxytocin Major
Frequently asked questions
Can I take Oxytocin with Phenylephrine po?
MediHelp rates the interaction as minor. Oxytocin 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. Oxytocin given together with sympathomimetic vasoconstrictors has been associated with excessive blood pressure elevation. Oral phenylephrine has low and variable bioavailability, so the effect is likely small but could matter in hypertensive or obstetric patients.
How serious is the interaction between Oxytocin 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 if the combination is used in an obstetric or hypertensive patient. Avoid oral decongestants in women with hypertensive disorders of pregnancy.
What other medicines interact with Oxytocin?
MediHelp also lists interactions of Oxytocin with, for example, Carboprost tromethamine, Dinoprostone, Ephedrine. The full list is on the Oxytocin page.
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