Ciclestine is the trade name and generic name for betahistine hydrochloride, which has the effect of dilating cardiac and cerebral blood vessels, increasing blood supply to the heart and cerebral arteries, and improving circulation. There are side effects such as loss of appetite, palpitations, and itchy skin. Betahistine hydrochloride is a histamine drug, clinically available in oral and intravenous preparations, with the efficacy of dilating cardiac and cerebral blood vessels, increasing blood supply to the heart and cerebral arteries, and improving circulation, clinically used in the treatment of vertigo in the inner ear, arteriosclerosis, ischemic cerebrovascular disease, and postural vertigo due to hypertension, tinnitus. The adverse reactions of this product include side effects such as loss of appetite, stomach upset, palpitations, skin itching, dizziness and fever. It is contraindicated in people who are allergic to the drug and in children. Note that it is used with caution in patients with peptic ulcer, bronchial asthma, pheochromocytoma. It is necessary to pay attention to the appearance of fever to prevent adverse consequences. The drug needs to be used under the guidance of a physician, not blindly on its own, so as not to cause adverse effects.