Betahistine Hydrochloride Tablets do not usually cause drowsiness. Betahistine Hydrochloride Tablets is a western medicine, belongs to the vasodilator, mainly used in the treatment of Meniere’s syndrome, vascular headache and acute ischemic cerebrovascular disease. The adverse effects of betahistine hydrochloride tablets include dry mouth, stomach upset, palpitations, etc. A few patients may experience nausea, dizziness, head swelling, etc., but generally do not cause drowsiness. The contraindications of betahistine hydrochloride tablets have not been clarified, but they should be used with caution in patients with peptic ulcer and bronchial asthma. If drowsiness occurs while taking betahistine hydrochloride tablets, it is considered to be caused by recent sleep deprivation and overwork, and to a lesser extent, it may also be caused by anemia, hypothyroidism, depression and other diseases. Betahistine Hydrochloride Tablets usually do not cause patients to experience drowsiness, drowsiness during the use of medication, you should rest more, if the situation has not been improved, it is recommended to consult a doctor for examination, a clear diagnosis, and choose the appropriate way to treat.