Drug interactions
Clemastine + Phenylephrine po
Severity: Minor
Clemastine 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 partly counteract the drowsiness caused by clemastine, as in many combination cold products. No important harmful interaction is expected at usual doses.
What this interaction means in plain words
Clemastine 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 pharmacodynamic effects on CNS arousal; no established pharmacokinetic mechanism.
What to do
No specific action is needed; remind the patient that sedation from clemastine can persist despite the decongestant.
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 Clemastine
Frequently asked questions
Can I take Clemastine with Phenylephrine po?
MediHelp rates the interaction as minor. Clemastine 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 partly counteract the drowsiness caused by clemastine, as in many combination cold products. No important harmful interaction is expected at usual doses.
How serious is the interaction between Clemastine 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 is needed; remind the patient that sedation from clemastine can persist despite the decongestant.
What other medicines interact with Clemastine?
MediHelp also lists interactions of Clemastine with, for example, Alfentanil, Benzhydrocodone / acetaminophen, Buprenorphine buccal. The full list is on the Clemastine page.
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