Theophylline extended-release tablets and montelukast sodium tablets differ in indications, adverse reactions, contraindications and other aspects. 1. Indications: Theophylline extended-release tablets are suitable for bronchial asthma, wheezing bronchitis, obstructive emphysema, cardiogenic asthma and other diseases, to relieve the symptoms of wheezing; montelukast sodium tablets are suitable for the prevention and long-term treatment of asthma at the age of 15 years and above, and can be used to alleviate the symptoms caused by allergic rhinitis. 2. Adverse reactions: nausea, vomiting, tachycardia, arrhythmia, insomnia, fever and other symptoms may occur after the use of Theophylline Extended-Release Tablets; Montelukast Sodium Tablets may occur after the use of upper respiratory tract infections, dizziness, drowsiness, diarrhea, indigestion and other adverse reactions. 3. Contraindications: theophylline extended-release tablets are contraindicated in patients with allergy to theophylline extended-release tablets, active peptic ulcer, uncontrolled convulsive diseases, etc.; allergy to the ingredients in montelukast sodium is contraindicated. It is recommended that the medication be used in strict compliance with medical advice.