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the claim

Tylenol PM can cause wakefulness in certain individuals

the verdict
SUPPORTED
the evidence backs this
Recorded sources
2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Tylenol PM can cause wakefulness in certain individuals?

Yes. Tylenol PM contains diphenhydramine, an antihistamine that normally causes drowsiness but can paradoxically induce wakefulness or excitation in certain individuals.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked

The analysis

The claim is supported by medical case reports demonstrating that diphenhydramine (the sedating component of Tylenol PM) can cause paradoxical excitation or wakefulness in susceptible individuals, such as ultrarapid metabolizers.

Evidence for · 2
Paradoxical Excitation on Diphenhydramine May Be Associated with Being a CYP2D6 Ultrarapid Metabolizer:<i>Three Case Reports</i>
2008
Diphenhydramine, the active sedating antihistamine in Tylenol PM, can occasionally cause paradoxical excitation in certain individuals.
Get citation
Leon, J. d. & Nikoloff, D. M. (2008). Paradoxical Excitation on Diphenhydramine May Be Associated with Being a CYP2D6 Ultrarapid Metabolizer:<i>Three Case Reports</i>. doi.org. https://doi.org/10.1017/s109285290001628x

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More for · 1
From sedation to stimulation: anecdotal case reports of enhanced sexual arousal in men and women taking diphenhydramine hydrochloride.
2026
Case reports document unexpected stimulation and excitation responses to diphenhydramine instead of sedation.
Get citation
MP, R. & JG, P. (2026). From sedation to stimulation: anecdotal case reports of enhanced sexual arousal in men and women taking diphenhydramine hydrochloride.. doi.org. https://doi.org/10.1093/sexmed/qfag011

What does the evidence say?

The claim is supported by medical case reports demonstrating that diphenhydramine (the sedating component of Tylenol PM) can cause paradoxical excitation or wakefulness in susceptible individuals, such as ultrarapid metabolizers.

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8404 Aug 2026
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