According to the instruction of wheezing injection (dihydroxypropyltheophylline injection), it needs to be diluted and prepared with 5% or 10% glucose injection, and if it is prepared with saline, it belongs to over-expression of the instruction, and it is not recommended to prepare it with saline. The reason why it is not recommended to use saline to prepare Dihydroxypropyl Theophylline Injection is that Dihydroxypropyl Theophylline Injection has high alkalinity, which is not easy to be tolerated by human body, and its irritation can not be alleviated by using saline, and the use of dextrose as a solvent can play the role of neutralization and buffer, which can reduce the irritation and the occurrence of phlebitis. Dihydroxypropyl theophylline injection indications: for various diseases caused by airway spasm caused by wheezing symptoms, such as chronic bronchitis, chronic obstructive pulmonary disease, bronchial asthma and so on. Dihydroxypropyl theophylline injection adverse reactions: nausea, insomnia, cardiac arrhythmia, increased heart rate and other adverse reactions can occur. Adverse reactions can be serious respiratory and cardiac arrest. Contraindications to dihydroxypropyl theophylline injection: dihydroxypropyl theophylline injection is contraindicated in patients with active peptic ulcer and uncontrolled convulsive disease. Precautions for the use of dihydroxypropyltheophylline injection: caution should be exercised in patients with hypertension or a history of peptic ulcer, and caution should be exercised in pregnant women, women in labor, and breastfeeding women. It is recommended that patients actively seek medical attention in the hospital to clarify the diagnosis, and use the medication under the doctor’s supervision.