Levohydroxypropylpiperazine capsule is a western medicine component of the drug, mainly used in acute upper respiratory tract infections, acute bronchitis, acute attacks of chronic bronchitis, as well as pneumonia and other causes of dry cough and persistent irritating cough. It can also be used in cough variant asthma, which is a special type of bronchial asthma, for the purpose of cough suppression. During the use of this drug, there are some people who experience adverse reactions, which are manifested as gastrointestinal irritation, such as nausea, abdominal pain, vomiting, and even diarrhea. There are also some central nervous system reactions, such as fatigue, drowsiness, headache, as well as palpitations, dry mouth, dry tongue, and occasionally visual disturbances.