Drug interactions
Oxymetazoline + Phenylephrine
Severity: Moderate
Oxymetazoline and Phenylephrine: 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
Both are alpha-adrenergic vasoconstrictors, so combined use, particularly systemic phenylephrine with nasal oxymetazoline, can add to pressor effects. This may raise blood pressure and cause palpitations in susceptible patients.
What this interaction means in plain words
Oxymetazoline and Phenylephrine 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.
Oxymetazoline belongs to Respiratory; Phenylephrine belongs to Respiratory.
Why it happens
Additive alpha-adrenergic agonist vasoconstriction.
What to do
Avoid concurrent use of multiple decongestants. Monitor blood pressure in patients with hypertension or heart disease if combined.
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
Other interactions of Oxymetazoline
- Isocarboxazid + Oxymetazoline Major
- Oxymetazoline + Phenelzine Major
- Oxymetazoline + Tranylcypromine Major
- Amitriptyline + Oxymetazoline Moderate
- Amoxapine + Oxymetazoline Moderate
- Clomipramine + Oxymetazoline Moderate
Frequently asked questions
Can I take Oxymetazoline with Phenylephrine?
MediHelp rates the interaction as moderate. Oxymetazoline and Phenylephrine 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. Both are alpha-adrenergic vasoconstrictors, so combined use, particularly systemic phenylephrine with nasal oxymetazoline, can add to pressor effects. This may raise blood pressure and cause palpitations in susceptible patients.
How serious is the interaction between Oxymetazoline and Phenylephrine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use of multiple decongestants. Monitor blood pressure in patients with hypertension or heart disease if combined.
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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