Drug interactions
Moxisylyte + Phenylephrine
Severity: Minor
Moxisylyte and Phenylephrine: 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
Moxisylyte is an alpha-1 adrenergic blocker, whereas phenylephrine is an alpha-1 agonist. Given together, the vasoconstrictor and pressor effects of phenylephrine may be blunted.
What this interaction means in plain words
Moxisylyte and Phenylephrine 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 at alpha-1 adrenergic receptors.
What to do
Expect a reduced pressor or decongestant response to phenylephrine and titrate it to blood pressure effect if both must be used.
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
Frequently asked questions
Can I take Moxisylyte with Phenylephrine?
MediHelp rates the interaction as minor. Moxisylyte and Phenylephrine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Moxisylyte is an alpha-1 adrenergic blocker, whereas phenylephrine is an alpha-1 agonist. Given together, the vasoconstrictor and pressor effects of phenylephrine may be blunted.
How serious is the interaction between Moxisylyte and Phenylephrine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Expect a reduced pressor or decongestant response to phenylephrine and titrate it to blood pressure effect if both must be used.
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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