Long-term use of Compound Methenamine Capsules is generally not recommended, and may lead to adverse reactions such as epigastric discomfort, dry mouth, drowsiness, palpitations (rapid heartbeat, often accompanied by panic), and nausea. Compound methoxyphenamine capsule is a compound preparation, which has the effect of relaxing bronchial smooth muscle, reducing bronchial mucosal congestion and edema, relieving cough, anti-allergy, etc. It is suitable for the treatment of bronchial asthma and wheezing bronchitis. And the drug is generally not recommended for long-term use, for those who do not have a good therapeutic effect, they should seek medical treatment in time. The drug should be contraindicated in patients who are allergic to the product, with asthma crisis, active peptic ulcer, severe cardiovascular disease, as well as in children under 8 years of age. In the course of treatment with the drug may lead to some tolerable adverse reactions, such as epigastric discomfort, dry mouth, drowsiness, palpitations, nausea, usually disappear spontaneously after stopping the drug. The specific use of the drug should be under the guidance of a specialist, not unauthorized use of drugs.