Ketamine, sold under the brand name Ketalar among others, is a medication
Common side effects include psychological reactions as the medication wears off.[22] These reactions may include agitation, confusion, or hallucinations
Ketamine was discovered in 1962, first tested in humans in 1964, and was approved for use in the United States in 1970.[21][25] Shortly after its US approval it was extensively used for surgical anesthesia in the Vietnam War