Does NyQuil Have Doxylamine? A Look at Its Active Ingredients
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4 min read
Yes, standard Vicks NyQuil Cold & Flu formulations do contain doxylamine succinate [1.2.2, 1.2.6]. This active ingredient is a first-generation antihistamine responsible for the medication's characteristic drowsiness, helping users rest while relieving cold symptoms like sneezing and runny nose [1.2.6, 1.3.3].