Butylphthalide is a commonly used drug for the treatment of ischemic cerebrovascular disease and is generally taken orally as two capsules three times a day for a course of 20 days. It is often clinically recommended to be taken for 1-3 months, or longer, depending on the patient’s condition. Butylphthalein is the active ingredient extracted from watercress into the drug, is currently more advanced to establish the lateral branch circulation drugs, so need to take a longer time to achieve better therapeutic effect, usually clinical advice to take 1-3 months or even longer, the specific should be subject to individual recovery situation. Its main role is to protect mitochondrial function, increase oxygen supply to mitochondria, scavenge free radicals, and can be used to treat brain damage caused by ischemic stroke, and significantly increase brain microcirculation, reduce brain cell death, reduce brain edema, etc.. In addition, this drug can partially inhibit thrombosis and promote the recovery of neurological function of brain cells, among other effects. Occasionally, butylphthalide may cause a mild increase in transaminases or gastrointestinal discomfort. Therefore, patients’ liver and kidney functions should be monitored after taking the drug, and discontinuation is recommended in case of abnormal liver and kidney functions.