Insufficient blood supply to the vertebral artery can be treated with oral betahistine to improve the symptoms. The vertebral artery mainly supplies blood to the brain. Cervical spondylosis or atherosclerosis can lead to narrowing of the vertebral artery, causing insufficient blood supply to the brain, which can be manifested as dizziness and nausea. Dizziness and nausea caused by insufficient blood supply to the vertebral artery needs to be treated with drugs that improve the blood supply to the brain, and the drugs commonly used in the clinic are betahistine. The main effect of betahistine is to dilate arterial blood vessels, especially dilate cerebral blood vessels more obvious, can significantly increase the blood supply to the brain. Betahistine adverse reactions include dizziness, nausea, cystitis, etc. Allergy to drug components, pheochromocytoma, active ulcer patients are prohibited, the specific dosage should follow the doctor’s instructions.