After a cerebral infarction butylphthalide can be taken for up to 20 consecutive days. Butanephthalein is a kind of drug for the treatment of mild and moderate cerebral infarction. Butanophthalein has the effect of improving the microcirculation of the ischemic part of the brain, protecting the nerve cells that are not yet necrotic, reducing cerebral edema, and antithrombotic. However, butanephthalein may have side effects affecting heart rhythm, liver and kidney function, and coagulation function. Use with caution in patients with bradycardia, sick sinus syndrome, those with hepatic or renal impairment, and those with severe bleeding tendency. The use of butylphthalein after cerebral infarction requires consultation with a specialist and is not recommended for long-term use beyond the instructions.