How Long Does NyQuil Last: An Answer From A Expert

The question, How long does NyQuil last in your body and/or system after the expiration date or after opening is a common question and it has been asked several times on Reddit. In this article, we are going to give a detailed answer to it and we would also tell you how to counteract Nyquil just in case.

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.

NyQuil provides temporary relief for coughing, headaches, stuffy and runny nose, sore throat, fever, and sneezing. It also helps people with cold symptoms sleep through the night.

While it provides relief for cold symptoms, it is not a cure for the common cold or the flu. NyQuil is generally safe and effective for adults and children over the age of 6.


Nyquil Ingredients

There are three core or active ingredients in NyQuil:

  • Acetaminophen (reduces fever and alleviates minor pain)
  • Dextromethorphan (DMX) (alleviates coughing)
  • Doxylamine (relieves congestion, sneezing, and sore throat)

Nyquil Side Effects

These are some of the predominant side effects of Nyquil:

  1. Blurred vision.
  2. Dizziness.
  3. Drowsiness.
  4. Dry mouth, nose, or throat.
  5. Lightheadedness.
  6. Nausea and vomiting.
  7. Nervousness and excitability.
  8. Stomach pain.
  9. Hangover
  10. Bad for liver

How Long Does Nyquil Last?

Drowsiness impact after one has taken Nyquil does regularly keep going for around 4-6 hours or at times 7-8 hours. Some of the time this figure can contrast as each human is novel and impact can differ from one individual to the next.


When you have taken a last portion of Nyquil, you can in any case experience some unsteadiness considerably following eight hours. This implies it can influence your driving capacities out and about, weaken school or even school fill in just as influence the hardware.

This is the fundamental motivation behind why you ought to see to what extent the Nyquil remains in the framework. To assess term, you can think about half-existences of the Nyquil substance fixings.

All the Nyquil plans, for the most part, can contain the doxylamine succinate to welcome on the rest. It would take up to a limit of 2.29 days to dispense with it from the body.


Nyquil Dosage Chart

Nyquil dosage chart is just a table showing the size or frequency you should take Nyquil base on your body weight, either as an adult or kid. The Nyquil dosage chart is shown below:

nyquil dosage chart

Nyquil Hangover

While NyQuil may provide relief at night, many people have trouble shaking the grogginess when they wake up. This is termed a NyQuil hangover, and those suffering from it will often do whatever it takes to emerge from it and feel like themselves again.

To alleviate this hangover effect, you’ll need to counteract Nyquil.


Nyquil Severe

NyQuil Severe Cold & Flu is a combination medicine used to treat headache, fever, body aches, cough, runny nose, sneezing, itching, and watery eyes caused by allergies, the common cold, or the flu. NyQuil Severe Cold & Flu will not treat a cough that is caused by smoking, asthma, or emphysema.

Nyquil severe Ingredients

In each 30 mL dose:

  • Acetaminophen 650 mg (Pain Reliever/Fever Reducer)
  • Dextromethorphan HBr 20 mg (Cough Suppressant)
  • Doxylamine Succinate 12.5 mg (Antihistamine)
  • Phenylephrine HCl 10 mg (Nasal Decongestant)

Frequently Asked Question On Nyquil

Here are some frequently asked questions answered in brief.


How to counteract Nyquil

As human we are prone to mistakes, you might have mistakenly taken Nyquil instead of Dayquil, or for any other reason you want to counteract Nyquil, here’s what to do.

  • Take a Red Bull (energy drink)
  • Take some tea, coffee or any other stimulant (the caffeine content in it should counteract the Nyquil effects)
  • Take a cold shower

How long does Nyquil take to kick in?

Nyquil has been known to take around 10 (ten) minutes to kick in your system, and later you will begin feeling better. The whole body feels warm, and the throbs will begin to blur away.

In no time, the eyelids will begin to hang. During this second, the compulsions to rest will be somewhat higher. Notwithstanding, attempt as much as possible as you need to rest around evening time.


This desire normally will, in general, kill the drowse factor, and it can toss the entire Nyquil experience.

How long will NyQuil put me to sleep for?

Utilizing Nyquil as a sleeping pill is known to make individuals sluggish and nod off. The length of rest can fluctuate contingent upon the individual. For a few, taking Nyquil is useful for sleeping between four to six hours while for other people, sleep endures between seven to eight hours.

Does NyQuil make it hard to wake up?

No, it won’t make it hard to wake up.
But it can lead to grogginess, sleep inertia, headaches or not feeling clear-headed when you wake up in the morning.


Does NyQuil make you drowsy the next day?

Yes, just as every other over-the-counter sleep aids, Nyquil can pose some risks including daytime drowsiness, confusion, constipation, dry mouth, and problems urinating.

Is NyQuil addictive?

An individual who utilizes NyQuil accurately in all likelihood won’t become an addict.

However, somebody who abuses NyQuil may create reliance on the . Somebody can abuse NyQuil by taking a lot of it or by taking it for inappropriate reasons, for example, to treat asthma or interminable bronchitis, or for amusement.


Does Nyquil make you hallucinate?

Notwithstanding what DXM is expected for, taken in higher dosages can cause hallucination and other side effects similar to those of ketamine and PCP.

Is Nyquil bad for your liver?

Yes, It is, because it contains several ingredients that can interact with alcohol and cause drowsiness, dizziness and liver damage. NyQuil contains acetaminophen, the active ingredient in Tylenol, and mixing alcohol with acetaminophen is hard on the liver

Brief Precautions

  • Take the drugs only if you have time for at least seven or eight hours of sleep. Even if you’ve had that much sleep, don’t drive if you feel drowsy.
  • Do not take an extra dose if you wake up in the middle of the night.
  • Never mix sleeping pills with alcohol, recreational drugs, or other sleep drugs or supplements, including over-the-counter nighttime pain relievers and antihistamines, such as Benadryl Allergy, that contain the sedative diphenhydramine.
  • Start with the lowest recommended dose, especially until you know how the drug affects you.
  • Be cautious about frequent use. Taking sleep drugs regularly can breed dependence and raise the risk of adverse effects.

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