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it just doesnt have the antihistamine (doxylamine) that NyQuil has. it doesnt contain a stimulant that will keep you awake. So, to answer your question: DayQuil will not keep you up at night. Dayquils antihistamine-free formula isnt likely to make you feel sleepy and shouldnt impair your ability to focus on daily tasks. but it isn’t in DayQuil or NyQuil either. there is also a drug called Mucinex or guaifenesin that is an expectorant, it helps loosen the gunk in your chest that rattles around when you cough. the drug pseudoephedrine is a stimulant, and it is used in cold medicines, but it is not in either DayQuil or NyQuil. since DayQuil doesn’t have a stimulant in it, it wont keep you awake at night. If any of these effects last or get worse, contact your doctor or. DayQuil is essentially the non-drowsy version of NyQuil. It simply omits the antihistamine that is included in NyQuil, which can cause drowsiness. DayQuil does not contain caffeine or any other stimulant.
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DayQuil is essentially the alternative you take to prevent the drowsiness symptoms associated with NyQuil. Dizziness, drowsiness, headache, nausea, nervousness, or trouble sleeping may occur. The short answer is: no, DayQuil does not keep you awake. DayQuil does not contain stimulants like caffeine or antihistamines that can cause drowsiness like those found in NyQuil. benadryl is the most popular antihistamine. Does DayQuil keep you awake The answer is no. the major side effect of antihistamines is their drowsiness. the ingredients in Nyquil are: Acetaminophen (pain reliever/fever reducer) Dextromethorphan (cough suppressant) and Doxylamine (antihistamine.) DayQuil has the exact same ingredients except they leave the antihistamine out. meaning one drug treats fever, one treats the congestion, one treats the cough, and so on. all cold medicines are a combination of drugs. the only things that keep you awake are stimulants.