Drug interactions
Phenylephrine + Trazodone
Severity: Minor
Phenylephrine 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 is primarily an alpha-1 antagonist and serotonergic agent with only weak norepinephrine reuptake inhibition, so potentiation of phenylephrine is not well established. Trazodone's alpha blockade may blunt phenylephrine's pressor effect instead. Clinical significance is likely small.
What this interaction means in plain words
Phenylephrine 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.
Phenylephrine belongs to Respiratory; Trazodone belongs to Central Nervous System.
Why it happens
Trazodone alpha-1 adrenergic blockade may oppose phenylephrine's vasoconstriction; potentiation is not established.
What to do
No routine change is needed; monitor blood pressure when phenylephrine is given systemically.
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 Phenylephrine
- Isocarboxazid + Phenylephrine Contraindicated
- Phenelzine + Phenylephrine Contraindicated
- Phenylephrine + Tranylcypromine Contraindicated
- Bromocriptine + Phenylephrine Major
- Cocaine + Phenylephrine Major
- Dihydroergotamine intranasal + Phenylephrine Major
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 with Trazodone?
MediHelp rates the interaction as minor. Phenylephrine 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 is primarily an alpha-1 antagonist and serotonergic agent with only weak norepinephrine reuptake inhibition, so potentiation of phenylephrine is not well established. Trazodone's alpha blockade may blunt phenylephrine's pressor effect instead. Clinical significance is likely small.
How serious is the interaction between Phenylephrine 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; monitor blood pressure when phenylephrine is given systemically.
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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