Since he had a stroke two years ago, in order to prevent recurrence, Old Wang has been buying flunarizine from the pharmacy and taking it regularly. Although there hasn't been another stroke, Old Wang noticed that his walking has become inconvenient, and he experiences involuntary tremors in his hands and feet. Sometimes, his tongue, lips, and jaw... Chlorprothixene is less common; butryophenone drugs like haloperidol (containing fluorine and piperazine) and trifluoperazine are more likely to cause drug-induced parkinsonism, though milder than phenothiazine drugs; benzamide derivatives, which are widely used clinically, therefore also frequently lead to drug-induced parkinsonism. Sulpiride and tiapride, commonly used for treating elderly mental disorders (depression and behavioral abnormalities), if taken long-term...