Which drug is an example of an anti-anxiety tranquilizer?

Valium, known generically as diazepam, is a medication that belongs to the benzodiazepine class of anti-anxiety tranquilizers. It is primarily used to treat anxiety disorders, muscle spasms, and seizures. Its calming effects make it effective in alleviating symptoms of anxiety by enhancing the effect of a neurotransmitter in the brain known as GABA (gamma-aminobutyric acid), which has an inhibitory effect on neural activity. This mechanism leads to a reduction in anxiety levels as well as inducing relaxation and sedation.

The other options do not fit the classification of an anti-anxiety tranquilizer. Amobarbital is a barbiturate, which has sedative properties but is not typically classified as an anti-anxiety drug in modern practice. Chloral hydrate is also used as a sedative but is less commonly prescribed today and is not specifically categorized as an anti-anxiety tranquilizer. Dexedrine, on the other hand, is a stimulant used primarily to treat ADHD and narcolepsy, which makes it the antithesis of a tranquilizer and unrelated to the treatment of anxiety.