Levopiperazine capsules are western medicine ingredients used mainly for dry and persistent irritating cough caused by acute upper respiratory tract infections, acute bronchitis, acute attacks of chronic bronchitis, and pneumonia. It can also be used in cough variant asthma, a special type of bronchial asthma, for the purpose of relieving cough. During the use of this drug, some people may experience adverse reactions, which manifest 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.