Drug interactions
Cyproheptadine + Phenylephrine po
Severity: Minor
Cyproheptadine 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
Oral phenylephrine is a mild stimulant decongestant and may slightly counter the drowsiness of cyproheptadine. The interaction is not well characterised and has little clinical consequence.
What this interaction means in plain words
Cyproheptadine 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
Opposing CNS effects; sympathomimetic stimulation versus H1 antihistamine sedation, not firmly established.
What to do
No specific action required; monitor for residual sedation and avoid driving if drowsy.
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 Cyproheptadine
- Cyproheptadine + Isocarboxazid Contraindicated
- Cyproheptadine + Phenelzine Contraindicated
- Cyproheptadine + Tranylcypromine Contraindicated
- Alfentanil + Cyproheptadine Major
- Belladonna and opium + Cyproheptadine Major
- Benzhydrocodone / acetaminophen + Cyproheptadine Major
Frequently asked questions
Can I take Cyproheptadine with Phenylephrine po?
MediHelp rates the interaction as minor. Cyproheptadine 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. Oral phenylephrine is a mild stimulant decongestant and may slightly counter the drowsiness of cyproheptadine. The interaction is not well characterised and has little clinical consequence.
How serious is the interaction between Cyproheptadine 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 specific action required; monitor for residual sedation and avoid driving if drowsy.
What other medicines interact with Cyproheptadine?
MediHelp also lists interactions of Cyproheptadine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Cyproheptadine page.
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