liquid ketamine belongs to a class of drugs known as dissociative anaesthetics. It is also known as Ketalar, Ketanest, and Ketaset. Ketamine was first discovered in 1962 and was used as a battlefield anaesthetic during the Vietnam War. Ketamine is an N-methyl-D-aspartate glutamate (NMDA) receptor, antagonist. It is available in a nasal spray, a troche (mouth lozenge), mouth wash, and as a cream applied topically.