Cocaine is a stimulant drug that increases the rate at which messages travel between the brain and the body. Cocaine is a stimulant, which means that it can make the user feel more energetic and confident. Some of the mental effects of cocaine include a euphoric, almost manic sense of excitement and alertness. Other mental effects include disinhibition, ego inflation, racing thoughts, and time feeling like it’s going much faster than it is in reality. CK, Calvin Klein (coke and ketamine)According to Erowid, this combo mixes the introspective nature of ketamine with the stimulant effects of cocaine.