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Author: Admin | 2025-04-28
Published Sep 21, 2022 Last updated Feb 25, 2025 Key points Most ZzzQuil products contain the active ingredient diphenhydramine, the same ingredient in Benadryl. The Ultra tablets contain doxylamine (an antihistamine similar to diphenhydramine). The adult dose of diphenhydramine is 25 to 50mg, taken every four to six hours. The adult dose of doxylamine is 25mg. AnswerZzzQuil Nighttime Sleep Aid is a product manufactured by Vicks in multiple formulations including:ZzzQuil LiquicapsZzzQuil Warming Berry LiquidZzzQuil Calming Vanilla Cherry LiquidZzzQuil Soothing Mango Berry Alcohol-Free LiquidZzzQuil Ultra TabletsMost ZzzQuil products contain the sedating antihistamine diphenhydramine, the active ingredient in Benadryl. ZzzQuil Ultra tablets contain doxylamine (an antihistamine similar to diphenhydramine). The onset of action of both diphenhydramine and doxylamine is about 30 minutes, and the maximum sedative effects begin 1-3 hours after taking a dose. For most individuals, the duration of action ranges from 4—6 hours.Liquid ZzzQuil Dosage RecommendationsAll liquid formulations of ZzzQuil contain 25 mg of diphenhydramine per 15 ml (one tablespoon). Per the manufacturer, the recommended dose is 30 ml (two tablespoonfuls) at bedtime, which equates to 50 mg of diphenhydramine. When using diphenhydramine as a sleep aid, single doses should not exceed 50 mg per dose. ZzzQuil Liquicaps Dosage RecommendationsEach liquicap of ZzzQuil contains 25 mg of diphenhydramine. The recommended dose at bedtime is 2 liquicaps at bedtime, for a total dose of 50 mg.ZzzQuil Ultra Tablets Dosage RecommendationsEach tablet of ZzzQuil Ultra contains 25 mg of doxylamine. The recommended dose at bedtime is 1 tablet at bedtime, for a
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