Betahistine injection generally refers to betahistine hydrochloride injection, there is no clinical course of treatment as such, patients are advised to follow the doctor’s instructions. Betahistine Hydrochloride Injection is an H1 receptor agonist, which can dilate cerebral blood vessels and cardiovascular vessels to improve blood circulation. Therefore, betahistine hydrochloride injection is commonly used to treat Meniere’s syndrome, vascular headache, cerebral atherosclerosis, cerebral thrombosis, cerebral embolism and so on. Since there is no such term as course of treatment in clinic, there is no such thing as how many days of Betahistine Hydrochloride Injection is a course of treatment. After the application of betahistine hydrochloride injection in some patients, occasional adverse reactions such as dry mouth, palpitation, skin itching, dizziness, etc., usually do not affect the continued use of the drug. If the organism is allergic to the drug components, the application is contraindicated. For peptic ulcer, bronchial asthma, pregnant women and other people, use Betahistine Hydrochloride Injection with caution, while children are contraindicated. Patients are advised to follow the doctor’s instructions to apply betahistine hydrochloride injection and not to use the drug or adjust the dosage by themselves to prevent accidents.