This combination medication is used to temporarily treat cough, stuffy nose, body aches, and other symptoms (such as fever, headache, sore throat) caused by the common cold, flu, or other breathing illnesses (such as sinusitis, bronchitis).

nasal congestion. sinus congestion & pressure. cough due to minor throat & bronchial irritation. cough to help you sleep.

This combination medication is used to temporarily treat symptoms caused by the common cold, flu, allergies, or other breathing illnesses (such as sinusitis, bronchitis). Dextromethorphan is a cough suppressant that affects a certain part of the brain, reducing the urge to cough.

Drug Label Information

How Soon Do You Feel Sleepy After Taking NyQuil? NyQuil usually triggers sleepiness approximately half an hour after a person takes the medication. Doctors may recommend waiting to take the medication until just before bedtime.

See also Warning section. Drowsiness, dizziness, blurred vision, upset stomach, nausea, nervousness, constipation, or dry mouth/nose/throat may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Taking NyQuil can make people drowsy and fall asleep, which is the major side effect of the drug. The duration and quality of sleep can vary depending on the person. Other, rarer, side effects are mainly due to the acetaminophen component and can include: Skin reddening.

How long does Nyquil's drowsiness last? Nyquil's active ingredient, doxylamine, which has antihistamine and sedating effects, can lead to sleepiness. Nyquil can cause different degrees of sleepiness, depending on the individual lasting anywhere from 4 to 6 hours on average.

How long does Nyquil's drowsiness last? Nyquil's active ingredient, doxylamine, which has antihistamine and sedating effects, can lead to sleepiness. Nyquil can cause different degrees of sleepiness, depending on the individual lasting anywhere from 4 to 6 hours on average.

Although it's safe when used correctly, people who misuse NyQuil jeopardize their health and risk addiction. Many people misuse NyQuil by taking it to fall asleep or by using it as a recreational drug.

How long does Nyquil's drowsiness last? Nyquil's active ingredient, doxylamine, which has antihistamine and sedating effects, can lead to sleepiness. Nyquil can cause different degrees of sleepiness, depending on the individual lasting anywhere from 4 to 6 hours on average.

Though NyQuil contains ingredients like doxylamine that are often prescribed for sleep, relying on NyQuil for sleep is not advised. Besides doxylamine, NyQuil contains other active ingredients like alcohol that should not be used for sleep. And even doxylamine is only meant as a short-term sleep aid.

Should You Take Nyquil for Sleep? NyQuil is not designed to be taken as a sleep aid, or for any purpose besides relieving cold or flu symptoms. Although doxylamine is an approved sleep aid when sold on its own, this sleep-inducing ingredient should generally not be used for more than two weeks.