Insufficient blood supply to the brain is usually due to atherosclerosis, which leads to thickening of the intima, and in severe cases, narrowing of the blood vessels. You can also prepare Chinese medicine to improve the blood supply to the brain, such as Brain Heart Clear Tablets, Heart Brain Ning Capsules, and Clear Brain and Rejuvenate Liquid, which are effective in improving the lack of blood supply to the brain. If the patient is older and has heavy atherosclerosis, he or she should also take anti-platelet aggregation drugs such as aspirin or clopidogrel hydrogen sulfate, as well as oral medications to protect the intima, such as statin lipid-lowering drugs, and vasodilators, such as flunarizine hydrochloride.