These drugs act to depress the central nervous system and are often called sleeping pills. They are derived from barbituric acid (C4H4N2O3), a combination of urea and malonic acid.
Depressants act as downers, and can slow the body and mind down. There are over 2000 known barbiturates. They are some of the most addictive drugs. They are often a substitute for alcohol (similar affects are produced). People use barbiturates to get a sense of euphoria and relaxation. It's illegal to take barbiturates without a doctor's prescription and supervision.
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