The main effect of aminophylline injection is to be able to relax the bronchial smooth muscle, dilate the patient’s airway, so as to achieve the effect of asthma, antispasmodic, aminophylline injection is able to increase cardiac output, dilate the renal arterioles, and increase renal blood flow and other effects. The drug is mainly used for bronchitis, asthma and other bronchial diseases, but can also be used to treat sick sinus node syndrome. Aminophylline injection has a relatively short duration of effect, so it is usually administered intravenously by drip. It is important to note that aminophylline injection is metabolized relatively quickly, so it must be injected slowly when treating symptoms such as chest tightness and dyspnea. It is contraindicated in patients who are allergic to the product, patients with active peptic ulcers and uncontrolled convulsive disorders. In case of sudden onset of symptoms such as chest tightness and dyspnea you can take an intravenous injection for quick relief of symptoms, and later take an intravenous drip for consolidation and maintenance. The dosage of aminophylline injection should not be too large, too large a dosage may lead to central nervous system excitement, insomnia and other symptoms, and in severe cases, convulsions may occur. The use of this drug should prohibit temporary discontinuation of the drug if an adverse reaction occurs. This product is usually used in hospitals by healthcare professionals.