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Benadryl®, or the generic diphenhydramine, is an antihistamine commonly used to treat allergy symptoms. It is also the primary ingredient in most over-the-counter sleep aids, because of its sedative side-effects.

If you've never taken diphenhydramine for sleep, chances are good that one will knock you out quickly. If you're still awake half-an-hour later, you can safely take a second dose, but no more.

Be aware that the sedative side-effects of diphenhydramine may last longer than expected, causing you to oversleep the next morning or feel groggy for several hours after waking.

If you have difficulty sleeping for more than two weeks, contact a physician for advice.

For more information about sleep hygiene, see the link.

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15y ago

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