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The Longevity Letter
Practical writing and video on living strong and active into your 90s. No hype, no supplements to sell. Just what the evidence supports and what it looks like on an ordinary Tuesday.
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MedicationsDiphenhydramine hydrochloride
The honest summary is that diphenhydramine does several things reliably and few of them are the things it is most used for.
2026-10-10 · 61 min read
MedicationsDiphenhydramine
It blocks histamine H1 receptors, which relieves itching, weals and nasal allergy symptoms.
2026-10-10 · 32 min read