What type of agent is nitrous oxide classified as in terms of its effect on anxiety?

Nitrous oxide is classified as an anxiolytic agent due to its ability to alleviate anxiety and induce feelings of relaxation and euphoria. This property makes it valuable in medical settings, particularly in dentistry and surgery, where anxiety can be a significant barrier for patients. The gas works by depressing the central nervous system, leading to a calming effect that can help patients feel more comfortable during procedures.

In this context, the other classifications do not apply: while antidepressants are used to treat depressive disorders, stimulants increase alertness and energy, and hallucinogens alter perception, mood, and cognitive processes. None of these effects align with the purpose and use of nitrous oxide in clinical practice, reinforcing its identification as an anxiolytic.