Which central nervous system depressant is commonly prescribed for anxiety?

Alprazolam is a medication within the benzodiazepine class that is frequently prescribed to manage anxiety disorders. Its effectiveness in reducing anxiety stems from its ability to enhance the effects of a neurotransmitter called gamma-aminobutyric acid (GABA) in the brain, which produces a calming effect. This makes it a go-to option for short-term relief of anxiety symptoms, particularly in cases such as panic disorder or generalized anxiety disorder.

Hydrocodone, while a depressant, primarily serves as a pain relief medication and is not indicated for anxiety treatment. Dextroamphetamine and Dexedrine are stimulants used mainly to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy, and do not have properties that relieve anxiety. Therefore, Alprazolam stands out as the correct answer because of its specific role and effectiveness in treating anxiety disorders.