Among the agents listed, which one is used to treat high anxiety levels?

Diazepam, commonly known as Valium, is a benzodiazepine that is frequently prescribed to manage anxiety disorders. It functions by enhancing the effects of the neurotransmitter gamma-aminobutyric acid (GABA) in the brain, leading to sedative, anxiolytic (anxiety-reducing), and muscle relaxant effects. This makes diazepam particularly effective for treating high anxiety levels, as it can help to calm excessive nervousness and promote relaxation.

In contrast, the other agents listed do not primarily target anxiety. Propofol is primarily an anesthetic agent, used for induction and maintenance of general anesthesia, while also providing sedation. It is not typically indicated for anxiety treatment. Both pancuronium and vecuronium are neuromuscular blocking agents used to induce paralysis during surgery or mechanical ventilation; they have no anxiolytic properties and are not used for managing anxiety. Therefore, diazepam stands out as the appropriate choice for treating high anxiety levels.