患男，60岁。突然失语，记忆力衰退。患者表情淡漠，焦虑，伴右侧肢体活动不利，右侧感觉障碍，步态障碍。现症见：智力下降，神情呆滞，懈怠思卧，齿枯发焦，腰酸腿软，头晕耳鸣，舌体瘦小，苔薄，脉沉细。治疗应首选的方剂是

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