The overall goal of this project is to develop initial human data on effects of novel compounds on safety (interactions with cocaine) and efficacy (subjective response to cocaine and self-administration data) in non-treatment seeking cocaine use disorder subjects. This project will provide innovative data on effects of novel compounds on cocaine self-administration in addition to needed safety data on drug interactions with cocaine. This is a Phase I human drug interaction study examining the safety of concurrent administration of cocaine with novel compounds, and the effects of the novel compounds on subjective response to cocaine and cocaine self-administration in non-treatment seeking cocaine use disorder subjects. This data will provide important information for go/no-go decisions on phase II clinical trials using medications as a tool to enhance abstinence. The initial compound to be studied will be the 5-HT2CR agonist lorcaserin, which has been shown to reduce cocaine self-administration and cue reactivity in rodents. In addition there is human safety data in non-cocaine using subjects for lorcaserin as it is currently FDA approved for obesity, but there is no human cocaine interaction/PK data and no PD data to support potential dosages for phase II clinical trials.