Betahistine is effective in treating vascular headache, cerebral arteriosclerosis and tinnitus. 1. Vascular headache: It is a headache caused by the diastolic dysfunction of blood vessels in the head. Betahistine has the ability to balance the neuronal discharge of the vestibular nucleus bilaterally, thus improving the blood supply to the brain. 2. Cerebral arteriosclerosis refers to a series of neurological and psychiatric symptoms caused by diffuse sclerosis, narrowing of the lumen and occlusion of small arteries in the brain vessels on the basis of systemic arteriosclerosis, reduction of blood flow to the brain parenchyma, and degeneration of nerve cells. Betahistine is a vasodilator, which can be used to treat this disease. 3. Tinnitus: the patient is conscious of the sound in the ear, the loudness varies, high pitch tinnitus can make the patient worry, affecting sleep and work. Its appearance is either intermittent or persistent. Betahistine is a weak agonist of H1 receptor and a strong antagonist of H3 receptor, which has the effect of improving blood circulation in the inner ear, reducing endolymphatic oedema, lowering the pressure in the inner ear and relieving tinnitus. Betahistine adverse reactions include dry mouth, stomach upset, palpitations, skin itching, rash, aggravation of peptic ulcers, dizziness, headache, headache, head swelling, sweating. It is contraindicated in patients who are allergic to the drug, suffer from active gastric ulcers and pheochromocytoma. Use with caution in patients with peptic ulcer, bronchial asthma and brown cell tumor. During the use of the drug, pay attention to rest, light diet, do not stay up late and drink alcohol, do not eat spicy and greasy food, avoid heavy physical labor, follow the doctor’s instructions for the use of the drug to prevent allergic reactions or contraindications to the use of the drug.