Ketamine

2-(2-chlorophenyl1)-(methylamino)-cyclohexanone hydrochloride, C₁₃H₁₆ClNO

A veterinary and medical anaesthetic, selling as Ketaset and Ketalar.It is usually used to for large animals, commonly horses.

Also used recreationally, known as K, Ket, Special K, or Vitamin K. It has dissociative and hallucinatory effects. Many drug users' first contact with Ketamine is usually involuntary, often from a pill sold as something else (commonly Ecstasy)