Theophylline
Theophylline, prescription drug used to treat asthma , a chronic disease of the respiratory system. It is also used to treat asthmalike symptoms in patients with emphysema , chronic bronchitis , and pulmonary (lung) disease. Theophylline is sometimes used to treat breathing problems in infants at risk for sudden infant death s yndrome (SIDS). As a bronchodilator, the drug works by relaxing constricted muscles of the lung’s bronchi, the two branches of the trachea (windpipe) that lead to the lungs. It also opens blood vessels in the lungs, improving circulation. Theophylline is available in capsule, tablet, and liquid form. All are taken orally, usually with food to prevent stomach irritation. Dosage in children under the age of 16 is based on body weight. Adult dosages usually start at 200 mg taken twice a day, which may be increased if needed. The maximum adult dose is 900 mg per day. Effectiveness is usually apparent within 48 to 72 hours. Patients with peptic ulcers, seizure disorde...