Dyphylline is a bronchodilator. It works by relaxing muscles in the airways to improve breathing.

Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.

The combination of dyphylline and guaifenesin is used to treat cough and breathing problems caused by bronchial asthma, chronic bronchitis, or emphysema. This medication is not a cure for asthma, bronchitis, or emphysema.

Dyphylline and guaifenesin may also be used for purposes not listed in this medication guide.

You should not use this medicine if you are allergic to dyphylline or guaifenesin. This medication will not treat an asthma attack.

Before taking this medication, tell your doctor if you have heart disease or a history of heart attack, high blood pressure, overactive thyroid, or a stomach ulcer.

Do not give this medication to a child younger than 4 years old. 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.

Drink extra fluids to help loosen the congestion and lubricate your throat while you are taking this medication.

Ask a doctor or pharmacist before using any other cough or cold medicine. Guaifenesin is contained in many combination medicines. Taking certain products together can cause you to get too much guaifenesin. Check the label to see if a medicine contains guaifenesin.

You should not use this medicine if you are allergic to dyphylline or guaifenesin. This medication will not treat an asthma attack.

To make sure you can safely take this medication, tell your doctor if you have any of these other conditions:

• heart disease or a history of heart attack;

• high blood pressure;

• overactive thyroid; or

• a stomach ulcer.

FDA pregnancy category C. It is not known whether dyphylline and guaifenesin will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication.

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