sedative [ˈsedətɪv]

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adj.使安静的，使镇静的；n. 镇静剂，能使安静的东西

a drug used to calm a person or animal or to make them sleep

After taking a sedative she was able to get to sleep. 服用了镇静剂后，她能够入睡了。
Amber bath oil has a sedative effect. 琥珀沐浴油有镇静安神效用。