Sibirin is able to treat cerebral insufficiency of blood supply, while vitamin E, ginkgo biloba drops and nimodipine can be applied. The main causes of cerebral blood supply insufficiency are cerebral arteriosclerosis and vascular spasm. Ciprofloxacin, vitamin E and Ginkgo biloba drops can soften blood vessels and improve cerebral blood supply; nimodipine can prevent cerebral vasospasm. Insufficient blood supply to the brain can be clinically categorized into insufficient blood supply to the carotid artery system and insufficient blood supply to the vertebral basilar artery system. Insufficient blood supply of carotid artery system, patients can manifest as episodic limb weakness, sensory abnormalities, hemianopsia, patients can also appear speech dysfunction, serious patients can appear transient amnesia and so on. Patients with insufficient blood supply to the vertebral basilar artery can have sudden onset of vertigo, nausea, vomiting, and patients can also have diplopia, dysarthria, ataxia, and some of the patients can also have balance disorders.