Drug interactions
Asenapine + Phenylephrine po
Severity: Minor
Asenapine 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
Asenapine blocks alpha-1 adrenergic receptors, while oral phenylephrine is an alpha-1 agonist. Their opposing actions may blunt the pressor effect of phenylephrine. Oral phenylephrine has low bioavailability, so the clinical effect is small.
What this interaction means in plain words
Asenapine 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
Pharmacodynamic antagonism between alpha-1 receptor blockade by asenapine and alpha-1 agonism by phenylephrine.
What to do
No action is usually required. Check blood pressure if a patient on asenapine needs a decongestant and responds unexpectedly.
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 Asenapine
- Asenapine + Pimozide Contraindicated
- Asenapine + Thioridazine Contraindicated
- Asenapine + Vandetanib Contraindicated
- Adagrasib + Asenapine Major
- Alfentanil + Asenapine Major
- Alfuzosin + Asenapine Major
Frequently asked questions
Can I take Asenapine with Phenylephrine po?
MediHelp rates the interaction as minor. Asenapine 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. Asenapine blocks alpha-1 adrenergic receptors, while oral phenylephrine is an alpha-1 agonist. Their opposing actions may blunt the pressor effect of phenylephrine. Oral phenylephrine has low bioavailability, so the clinical effect is small.
How serious is the interaction between Asenapine 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: No action is usually required. Check blood pressure if a patient on asenapine needs a decongestant and responds unexpectedly.
What other medicines interact with Asenapine?
MediHelp also lists interactions of Asenapine with, for example, Pimozide, Thioridazine, Vandetanib. The full list is on the Asenapine page.
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