The generic name of Asynchrony Injection is Dihydroxypropyl Theophylline for Injection and is indicated for the relief of wheezing symptoms. Examples include asthma caused by bronchial asthma, obstructive emphysema disease, and dihydroxypropyl theophylline for injection is also used for asthma caused by cardiogenic pulmonary edema. Dihydroxypropyl theophylline has similar effects to aminophylline, but the bronchodilating potency is only 1/10 of aminophylline. The drug can also relax the smooth muscle of the respiratory tract, enhance the diaphragm contraction force, and improve respiratory function, as well as stimulate the myocardium and increase the cardiac blood output. Adverse effects of injection of dihydroxypropyl theophylline include nausea, vomiting and tachycardia in large doses. In severe cases, fever, dehydration and convulsions may occur. Dihydroxypropyl Theophylline for Injection is contraindicated in patients with allergies, peptic ulcers and uncontrolled convulsive disorders. Precautions for dihydroxypropyl theophylline for injection are: this product is not preferred for acute severe asthma attacks, large doses will cause central nervous system excitation, premedication of sedative drugs can be prevented, hypertension and peptic ulcer patients use this product with caution. In summary, the use of dihydroxypropyl theophylline for injection should be under the guidance of a medical professional.