FAQs. Q: What's the difference between NyQuil and NyQuil SEVERE? A: NyQuil SEVERE delivers maximum symptom-fighting ingredients* to relieve your worst cold symptoms. Besides the active ingredients in NyQuil, NyQuil SEVERE contains 10 mg of phenylephrine HCl, a nasal decongestant.

What Is NyQuil? NyQuil is a common over-the-counter medication which treats the symptoms of the flu, the common cold, and other similar illnesses and allergies. It is manufactured and sold by Vicks, a U.S. medicine company.

VICKS DAYQUIL AND VICKS NYQUIL COLD AND FLU- acetaminophen, dextromethorphan hydrobromide, phenylephrine hydrochloride, and doxylamine succinate kit.

DayQuil Severe Cold and Flu is a combination medicine used to treat headache, fever, body aches, cough, chest congestion, stuffy nose, and sinus congestion caused by allergies, the common cold, or the flu. DayQuil Severe Cold and Flu will not treat a cough that is caused by smoking, asthma, or emphysema.

NyQuil can cause you to feel very drowsy or sleepy and you may fall asleep after taking it. Be careful when driving or operating machinery if you have taken this product. Avoid drinking alcoholic beverages with NyQuil. Alcohol, sedatives and tranquilizers can increase drowsiness when used with NyQuil.

Improper use of this medication (abuse) may result in serious harm (including brain damage, seizure, death). Tell your doctor if your condition lasts for more than 1 week, if it gets worse, or if it occurs with a headache that doesn't go away, rash, or fever lasting more than 3 days.

To alleviate symptoms, NyQuil contains three ingredients: Acetaminophen, an analgesic to stop pain like headaches. Dextromethorphan, a cough suppressant. Doxylamine, an antihistamine.

Nyquil Cold and Flu is a combination medication containing acetaminophen, dextromethorphan, and doxylamine. It's used to treat cold and flu symptoms, like sore throat, fever, cough, runny nose, sneezing, and aches.

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.

Common side effects may include:

• headache, sleep problems (insomnia);
• upset stomach, diarrhea or constipation;
• dry eyes, blurred vision, dry mouth or nose;
• mild dizziness or drowsiness, trouble concentrating;
• feeling restless or excited (especially in children); or.
• mild skin rash.

Dayquil Cold and Flu is generally safe to take, but it might not be the best choice for everyone. If you have a cough that's lasted for a long time, a cough that occurs with smoking, asthma, or emphysema, or a cough with a lot of mucus, this medication might not be right for you.

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.