Methylcobalamin is generally not required after cerebral infarction. Methylcobalamin is a drug that promotes myelin production and is mainly used to treat peripheral nerve injury, while cerebral infarction belongs to central nervous system injury. If it is a special case, for example, if the patient has cranial nerve damage as the main manifestation, you can consider taking methylcobalamin to promote the myelin repair of such as nerves, then the generally recommended course of treatment is about three months, or it can be extended to six months, the specific course of treatment depends on the speed of the patient’s recovery. Generally, the effective recovery period of cerebral infarction is within six months, and more than six months is the sequelae period, and further treatment with medication cannot help patients’ symptoms improve.