diphenhydramine hydrochloride + guaifenesin + levomenthol · Medicine question

How long after an oral dose does the diphenhydramine in Benylin Mucus Cough Night reach peak serum levels?

Name: How long after an oral dose does the diphenhydramine in Benylin Mucus Cough Night reach peak serum levels?
Published: 2026-11-08T13:49:48.229Z

iatroX medicinesPublished 8 November 2026

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Answer

The diphenhydramine in Benylin Mucus Cough Night reaches peak serum levels 2–2.5 hours after an oral dose.

Sources for this answer

Benylin Mucus Cough NightMcNeil Products Ltd · emc · SmPC §5.2 Pharmacokinetic properties · Version 9Document updated 4 September 2026

Sources checked 8 November 2026

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