What Is Nyquil?

Nyquil is a commonly used over the counter drug used to prevent the more severe symptoms of colds and flu such as fever and associated symptoms. It is important to contact your health care provider if you are planning to buy Nyquil to find out if this medicine is appropriate for you.

Nyquil contains a number of active ingredients including:

  • Dextromethorphan
  • Acetaminophen
  • Doxylamine succinate

These ingredients give Nyquil its pain relieving, antihistamine and cough suppressing properties.

Dosing instructions

For adults, take 2 tablespoonfuls of the medicine at intervals of six hours or as required for treatment of flu and cold symptoms. Never take in excess of four doses in one 24 hour period.

For children, you need to ask your health care providers if this medication is right for them.

Nyquil uses

Nyquil can be used for the short-term treatment and relief of flu and cold symptoms such as:

  • Coughs
  • Headaches
  • Throat soreness
  • Fever
  • Sneezing
  • Running nose
  • Trivial aches and discomfort

Nyquil use side-effects

  • Drowsiness
  • Tiredness
  • Excitability, particularly in young children.

Precautionary measures

  • Never take Nyquil if you drink more than three alcoholic beverages a day as the combination can lead to a deadly overdose. It is important to consult your health care provider before you buy Nyquil if you drink alcohol on a regular basis.
  • Due to the presence of the active ingredient acetaminophen in Nyquil, this combination can result in liver damage.
  • Never combine this drug with any other medications or drugs.
  • Ask your health care provider if you are unsure of anything as regards your use of Nyquil.

Contact your health care provider before taking Nyquil if:

  • You suffer from glaucoma, a severe cough brought about by┬ásmoking, asthma, emphysema or chronic bronchitis
  • You experience a cough that generates mucus
  • You suffer from breathing problems
  • You experience pain when urinating which may be the result of a distended prostate
  • you are on tranquilizers or sedatives
  • Breastfeeding and pregnant women should also consult their physicians first.


Stop taking Nyquil and call your health care provider if:

  • Cough or pain persists for more than a week
  • Fever persists for more than three days
  • Swelling or redness is noticeable in the region affected by pain
  • Fresh symptoms start to appear
  • Cough affects you again or is accompanied by a rash or persistent headaches

Important information

Do not use Nyquil if you are planning to drive your car, operate machines or do any other activities that require vigilance.

Nyquil can make you feel drowsy, so make sure that you have enough time to sleep before using this medicine.

Be sure to take Nyquil precisely as instructed by your personal health care provider or as per the instructions on the label. Never increase the recommended amounts or extend the length of time you are meant to use it. Cold medications are normally used for short term purposes only and dependency may result if this duration is not adhered to.

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