Abigail has been prescribed a drug to help her sleep. This drug depresses activity in her nervous system. She was likely prescribed a(n)

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Answer:  A barbiturate.

Explanation: A barbiturate is a drug that acts as a central nervous system depressant. Barbiturates are effective as anxiolytics, hypnotics, and anticonvulsants, but have physical and psychological addiction potential as well as overdose potential among other possible adverse effects.