Drug interactions
Phenylephrine po + Trazodone
Severity: Minor
Phenylephrine po and Trazodone: 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
Trazodone's alpha-blocking activity may blunt the pressor effect of oral phenylephrine, and its effects on adrenergic neurons could alter the response. Oral phenylephrine has low bioavailability so the effect is usually modest.
What this interaction means in plain words
Phenylephrine po and Trazodone 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-1 adrenergic antagonism by trazodone opposes the vasoconstrictor action of phenylephrine.
What to do
No routine change is needed with occasional decongestant use. Advise patients with hypertension to monitor their blood pressure.
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 Trazodone
- Arsenic trioxide + Trazodone Contraindicated
- Ibutilide + Trazodone Contraindicated
- Isocarboxazid + Trazodone Contraindicated
- Levoketoconazole + Trazodone Contraindicated
- Methylene blue + Trazodone Contraindicated
- Phenelzine + Trazodone Contraindicated
Frequently asked questions
Can I take Phenylephrine po with Trazodone?
MediHelp rates the interaction as minor. Phenylephrine po and Trazodone have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Trazodone's alpha-blocking activity may blunt the pressor effect of oral phenylephrine, and its effects on adrenergic neurons could alter the response. Oral phenylephrine has low bioavailability so the effect is usually modest.
How serious is the interaction between Phenylephrine po and Trazodone?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine change is needed with occasional decongestant use. Advise patients with hypertension to monitor their blood pressure.
What other medicines interact with Trazodone?
MediHelp also lists interactions of Trazodone with, for example, Arsenic trioxide, Ibutilide, Isocarboxazid. The full list is on the Trazodone page.
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