Smoking changes the way your body uses theophylline, and you may need a dosage adjustment. Do not take more of this medicine than is prescribed without consulting your doctor. Seek medical attention if you are having increasingly difficult breathing. Guaifenesin is an expectorant. It is used to break up congestion and mucous and to help you breathe more easily.
Theophylline is a bronchodilator.
The combination, guaifenesin and theophylline, is used to treat symptoms of asthma, bronchitis, and emphysema. Guaifenesin and theophylline may also be used for purposes other than those listed in this medication guide. It may be dangerous to take guaifenesin and theophylline if you have either of these conditions. You may not be able to take guaifenesin and theophylline, or you may require a lower dose or special monitoring during treatment if you have any of the conditions listed above. This means that it is not known whether guaifenesin and theophylline will harm an unborn baby.