What You Need to Know About NyQuil

NyQuil is a very popular medication used to treat cold and flu symptoms. Find out if it is right for you and your symptoms.

Active Ingredients (in each 15ml tablespoon):

Acetaminophen 500mg (pain reliever)
Dextromethorphan HBr 15mg (cough suppressant)
Doxylamine succinate 6.25mg (antihistamine)


    Adults - Two tablespoons every 6 hours as needed for cold and flu symptoms. Do not take more than 4 doses in 24 hours.

    Children - Ask a doctor.

      Uses for Nyquil:

      Temporary relief of cold and flu symptoms including:

      • Cough
      • Sore Throat
      • Headache
      • Minor Aches and Pain
      • Fever
      • Runny nose
      • Sneezing

        Side Effects of Nyquil:

        Excitability, especially in children


          • Do not consume if you drink more than three alcoholic drinks a day. Acetaminophen can cause liver damage. Ask your doctor if you should take acetaminophen if you regularly drink more than three alcoholic drinks per day.
          • Do not use with other medications containing acetaminophen.
          • Do not use this medication if you are taking an MAOI (medication for depression, psychiatric, emotional conditions or Parkinson's disease) or for two weeks after stopping an MAOI.

            Ask a Doctor Before Use:

            • If you have glaucoma
            • If you have a cough that produces a lot of mucous
            • If you have a breathing problem or chronic cough that is caused by asthma, smoking, chronic bronchitis or emphysema
            • If you have trouble urinating because of an enlarged prostate
            • If you are taking sedatives or tranquilizers
            • If you are pregnant or breastfeeding


              Stop use and ask doctor if:

              • Pain or cough worsens or lasts more than 7 days
              • Fever worsens or lasts more than 3 days
              • Redness or swelling is present in area causing pain
              • New symptoms occur
              • Cough returns or occurs with a rash or headache that won't go away

                Other NyQuil Information:

                Do not take this product when you have to operate machinery, drive a vehicle or perform other tasks that require alertness.
                Nyquil is likely to make you very drowsy, be sure you can devote time to sleep before taking this product.


                "NyQuil Liquid." Vicks. 2006. Proctor & Gamble. 17 Nov 2006.

                  Continue Reading