Barbiturates are among the most widely used drug?

Barbiturates are among the most widely used depressant drugs.

Explanation:

Barbiturates were among the most widely used depressant drugs.

Barbiturate is used for sleeping problems, seizures, and anxiety. An observation in the late '60s discovered that Barbiturates were addictive, since the 1970's, the use of Barbiturates has declined dramatically.

Barbiturate has more or less been replaced with Benzodiazepine.

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