Drug interactions
Phenylephrine + Risperidone
Severity: Minor
Phenylephrine and Risperidone: 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
Risperidone has alpha-1 blocking activity and can cause orthostatic hypotension, which may blunt the pressor effect of phenylephrine. The effect is usually modest.
What this interaction means in plain words
Phenylephrine and Risperidone 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; Risperidone belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism at alpha-1 adrenergic receptors.
What to do
Monitor blood pressure and titrate phenylephrine to response.
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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Frequently asked questions
Can I take Phenylephrine with Risperidone?
MediHelp rates the interaction as minor. Phenylephrine and Risperidone have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Risperidone has alpha-1 blocking activity and can cause orthostatic hypotension, which may blunt the pressor effect of phenylephrine. The effect is usually modest.
How serious is the interaction between Phenylephrine and Risperidone?
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 titrate phenylephrine to response.
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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