| sedatives, barbiturate | Those derivatives of barbituric or thiobarbituric acid that are used as hypnotics or sedatives. The structural class of all such derivatives, regardless of use, is barbiturates. (12 Dec 1998) |
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| sedatives, nonbarbiturate | Compounds with diverse chemical and pharmacological properties that have in common the ability to allay excitement and anxiety and at higher concentrations induce sleep. (12 Dec 1998) |