Flunarizine hydrochloride is a calcium channel blocker. It prevents cell damage caused by pathological intracellular calcium overload due to ischemia and other causes. It has the following effects: 1, relieves vasospasm, has a sustained inhibitory effect on persistent vasospasm caused by vasoconstrictive substances, especially more pronounced in the basilar artery and internal carotid artery; 2, vestibular inhibition, can increase blood flow in the small cochlear artery and improve vestibular organ circulation; 3, antiepileptic effect, this product can block pathological calcium overload of nerve cells and prevent paroxysmal depolarization, cellular discharge, and This product can block pathological calcium overload of nerve cells and prevent paroxysmal depolarization and cell discharge, thus avoiding seizures; 4, protect the myocardium and significantly reduce ischemic myocardial damage; 5, flunarizine also has the effect of improving renal function and is used for the treatment of chronic renal failure; in addition, flunarizine has the effect of antihistamine. The indications for flunarizine hydrochloride include cerebral ischemia, vertebral artery ischemia, post cerebral thrombosis, tinnitus, cerebral dizziness, as well as prevention of migraine, and adjuvant treatment of epilepsy.