Which category does Ketamine belong to among the seven drug categories?

Ketamine belongs to the category of Dissociative Anesthetic due to its unique pharmacological effects. This drug primarily functions by blocking the NMDA receptor in the brain, which results in a dissociative state characterized by feelings of detachment from the environment and the self. It is commonly used in medical settings for anesthesia and pain management but is also known for its potential for misuse and hallucinogenic effects.

In contrast to the other categories listed: stimulants primarily increase alertness and energy, opioids typically act as pain relievers and induce euphoria, and deliriants can cause severe confusion and disorientation. The distinct mechanism of action and effects associated with ketamine clearly align it with the characteristics of a dissociative anesthetic, making it the correct classification.