Chlorpheniramine is an antihistamine. It blocks the effects of the naturally occurring chemical histamine in the body. Chlorpheniramine prevents sneezing; itchy, watery eyes and nose; and other symptoms of allergies and hay fever.

Dextromethorphan is a cough suppressant. It affects the signals in the brain that trigger cough reflex.

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

The combination of chlorpheniramine and dextromethorphan is used to treat sneezing, itching, watery eyes, runny nose, and cough caused by allergies, the common cold, or the flu.

Chlorpheniramine and dextromethorphan may also be used for other purposes not listed in this medication guide.

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.

Do not use a cough or cold medicine if you have used an MAO inhibitor such as isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate) within the past 14 days. Serious, life-threatening side effects can occur if you take cough or cold medicine before the MAO inhibitor has cleared from your body.

Avoid drinking alcohol while you are taking this medication. It can add to drowsiness caused by an antihistamine.

Do not use any other over-the-counter cough, cold, allergy, or sleep medication without first asking your doctor or pharmacist. If you take certain products together you may accidentally take too much of one or more types of medicine. Read the label of any other medicine you are using to see if it contains an antihistamine or cough suppressant.

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

Do not use a cough or cold medicine if you have used an MAO inhibitor such as isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate) within the past 14 days. Serious, life-threatening side effects can occur if you take cough or cold medicine before the MAO inhibitor has cleared from your body.

Before taking this medication, tell your doctor if you are allergic to any drugs, or if you have:

• glaucoma;

• kidney disease;

• liver disease;

• diabetes;

• glaucoma;

• heart disease or high blood pressure;

• thyroid disease;

• emphysema or chronic bronchitis;

• an enlarged prostate; or

• problems with urination.

If you have any of these conditions, you may need a dose adjustment or special tests to safely take chlorpheniramine and dextromethorphan.

This medication may be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.

This medication may pass into breast milk and could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

Artificially-sweetened liquid forms of this medicine may contain phenylalanine. This would be important to know if you have phenylketonuria (PKU). Check the ingredients and warnings on the medication label if you are concerned about phenylalanine.