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What is a better sleep aid doxylamine or diphenhydramine?

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Doxylamine succinate is one of the most sedating antihistamines available over-the-counter (stronger than diphenhydramine). A single dose causes rapid and marked drowsiness in the vast majority of individuals. Unlike diphenhydramine, most people don't develop a tolerance to the sedating effects of doxylamine succinate.
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