Dihydroxypropyl theophylline can relax the bronchial smooth muscle, and can be used to relieve the wheezing symptoms caused by bronchial asthma and wheezing bronchitis. Dihydroxypropyltheophylline can inhibit phosphodiesterase, so that the intracellular cAMP content increases, the respiratory smooth muscle has a direct relaxation effect, clinically used in the treatment of bronchial asthma, obstructive emphysema, wheezing bronchitis, cardiogenic pulmonary edema and other wheezing symptoms caused by. Dihydroxypropyl theophylline should not be used in people with a history of hypersensitivity to this drug, and is also contraindicated in patients with active peptic ulcers and uncontrolled convulsive disorders. Dihydroxypropyl theophylline should be strictly controlled dose, when the dose is too high may be nausea and vomiting, agitation, insomnia, and even symptoms such as dehydration and convulsions. Dihydroxypropyl Theophylline should be used strictly in accordance with the doctor’s instructions, if any discomfort occurs, consult a doctor promptly.