Cytarabine is usually administered for about six months, but there is no exact prescribed duration of administration in the clinic. Cytarabine sodium is commonly used in the treatment of craniocerebral injury, cerebral infarction, cerebral hemorrhage sequelae. It is involved in the biosynthesis of lecithin, which has the effect of improving cerebral circulation and promoting the recovery of brain function. Specifically how long to take, the instructions and the corresponding disease guidelines are not clearly specified. The actual application is recommended to depend on the patient’s condition. It is generally recommended that patients take it for half a year. If it is effective, it can be continued; if it is not effective, stop taking it. Cytarabine is relatively safe. However, a few people may experience mild gastrointestinal symptoms such as nausea and bloating after use. It is contraindicated in patients with a history of allergy to any of the components of this drug. Whether you need to take it, and for how long, you should go to the hospital, and your doctor will make a specific decision based on the patient’s specific condition and the efficacy of Cytarabine after taking it.