You need to find the cause of insufficient blood supply to the brain before deciding what medication to take to regulate it. The causes of insufficient blood supply to the cerebral vessels are usually carotid artery stenosis and vertebral artery stenosis. The cause of carotid artery stenosis is usually atherosclerosis or thrombosis. The formation of atherosclerotic plaques or blood clots in the carotid arteries leads to carotid artery stenosis, which then causes ischemia in the brain it supplies. Treatment usually involves the administration of drugs such as aspirin and atorvastatin. The vertebral artery is an important source of blood vessels supplying the basilar arterial ring of the brain, and the usual cause of its narrowing is related to compression of the vertebral artery as a result of severe cervical spondylosis. Examples include atlantoaxial subluxation and cervical disc herniation. In this case, traction and immobilization or surgical treatment is required. Medications can be supplemented with some anti-inflammatory and pain-relieving drugs, such as acetylsalicylic acid. The above drugs need to identify the cause of the disease, under the guidance of the doctor to use, can not be used indiscriminately.