镇静剂(sedative)或镇静药[1],也稱安定药[2](tranquilliser),与鎮定劑(downer)相似,是一種能產生镇静作用的物質[3][4]。镇静剂有助缓解抑郁及焦虑;通常被用作治療精神紧张的病者,镇静剂有利于人的镇静。
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