Acetaminophen is a pain reliever and fever reducer.

Chlorpheniramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.

Dextromethorphan is a cough suppressant. It affects the cough reflex in the brain that triggers coughing.

Acetaminophen, chlorpheniramine, and dextromethorphan 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.

This medicine will not treat a cough that is caused by smoking, asthma, or emphysema.

Acetaminophen, chlorpheniramine, and dextromethorphan may also be used for purposes not listed in this medication guide.

Do not use this medicine if you have taken an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include furazolidone, isocarboxazid, linezolid, phenelzine, rasagiline, selegiline, and tranylcypromine.

You should not use this medication if you are allergic to acetaminophen (Tylenol), chlorpheniramine, or dextromethorphan.

Ask a doctor or pharmacist before taking this medicine if you have any medical condition, especially:

• asthma or COPD, cough with mucus, or cough caused by smoking, emphysema, or chronic bronchitis;
• a blockage in your stomach or intestines;
• liver disease, cirrhosis, a history of alcoholism, or if you drink more than 3 alcoholic beverages per day;
• kidney disease;
• an enlarged prostate, problems with urination;
• glaucoma; or
• if you take potassium (Cytra, Epiklor, K-Lyte, K-Phos, Kaon, Klor-Con, Polycitra, Urocit-K).

It is not known whether this medicine will harm an unborn baby. Do not use cough and cold medicine without a doctor's advice if you are pregnant.

This medicine may pass into breast milk and may harm a nursing baby. Antihistamines may also slow breast milk production. Do not use cough and cold medicine without a doctor's advice if you are breast-feeding a baby.

Artificially sweetened liquid medicine may contain phenylalanine. Check the medication label if you have phenylketonuria (PKU).

Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Use Nyquil Cold & Flu (Acetaminophen, Chlorpheniramine, And Dextromethorphan) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

In rare cases, acetaminophen may cause a severe skin reaction that can be fatal. This could occur even if you have taken acetaminophen in the past and had no reaction. Stop taking this medicine and call your doctor right away if you have skin redness or a rash that spreads and causes blistering and peeling. If you have this type of reaction, you should never again take any medicine that contains acetaminophen.

Stop using the medicine and call your doctor at once if you have:

• severe headache, seizure (convulsions);
• fast, pounding, or uneven heartbeats;
• confusion, hallucinations, severe dizziness or drowsiness, slow or shallow breathing;
• tremor, restless muscle movements;
• little or no urination;
• flu symptoms, easy bruising, unusual bleeding, pale skin, weakness, feeling light-headed; or
• nausea, pain in your upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).

Side effects such as dry mouth, constipation, and confusion may be more likely in older adults.

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.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Ask a doctor or pharmacist before using any other cold, allergy, pain, or sleep medication. Acetaminophen (sometimes abbreviated as APAP) is contained in many combination medicines. Taking certain products together can cause you to get too much acetaminophen which can lead to a fatal overdose. Check the label to see if a medicine contains acetaminophen or APAP.

Avoid drinking alcohol. It may increase your risk of liver damage while you are taking acetaminophen, and can increase certain side effects of chlorpheniramine.

This medication may cause blurred vision and may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.