The side effects of betahistine hydrochloride tablets mainly include abdominal vasospasm, abdominal pain, nausea, vomiting, headache, facial flushing and other adverse reactions. These side effects occur mainly because it is a derivative of histamine, which is a vasodilator and can effectively help patients relieve the symptoms of vertigo and dizziness, and especially has a good effect on the circulation of the inner ear microvessels. Because of these side effects, special care should be taken when using it. Avoid spicy and oily foods in the diet, especially for patients with peptic ulcers and bronchial asthma, because it can cause aggravation of the disease. In addition, it may cause an increase in blood pressure in patients who have adrenal medullary tumors of the kidneys. This drug can enter the body of young children through breast milk, so it should be used with caution in women who are breastfeeding.