Flunarizine Hydrochloride is a commonly used medication with fewer side effects when used in a standardized manner, which may include drowsiness and depression. Flunarizine hydrochloride can be used to treat central vertigo, peripheral vertigo, idiopathic tinnitus, intermittent claudication, as well as migraine prophylaxis, and recovery from cerebral infarction. According to the instructions, common adverse drug reactions to Flunarizine Hydrochloride include drowsiness, fatigue, depression, involuntary movements, dyskinesia, tonicity, insomnia, anxiety, burning sensation in the stomach, hypergastrariness, increased eating, weight gain, rash, dry mouth, breast milk spillage, and muscle aches and pains. The above symptoms are mostly transient and can be relieved by stopping the drug, with individual differences. This drug is contraindicated in allergic individuals, patients with a history of depression, Parkinson’s disease and patients with symptoms of other extrapyramidal disorders. Flunarizine hydrochloride should be used under the supervision of a physician, and if any adverse reactions occur, prompt medical attention is required.