A 2-part, Phase 1b Clinical Study Designed to Evaluate the Safety, PK, and Efficacy of CRB-913 in Participants With Obesity

This study will assess the safety of the investigational drug CRB-913 and how it is processed in the body. The study has two parts: Part 1 will measure drug levels in healthy adults after taking CRB-913 tablets, and Part 2 will compare three doses of CRB-913 with placebo to evaluate safety, effects on body weight, and drug levels in the blood. Part 2 is blinded, meaning participants, study doctors, and the sponsor will not know which treatment is given. Participants in Part 2 will take study treatment for 12 weeks and will be followed for 28 days after treatment ends.

CRB-913 is a novel cannabinoid receptor type 1 (CB1) inverse agonist (CB1-IA) that is being developed for once-daily treatment of obesity. This study will look at how the investigational drug CRB-913 behaves in the body and how it affects body weight. The study has two parts: Part 1 will include healthy adult participants. They will receive CRB-913 in tablet form. Researchers will measure how much of the drug enters the bloodstream and how long it stays there. Part 2 will include participants who will receive one of three different doses of CRB-913 or a placebo (a tablet with no active drug). This part of the study will look at the safety of CRB-913 and its effects on body weight. Researchers will also measure the amount of CRB-913 in the blood. Part 2 is blinded, which means that participants, study doctors, and the study sponsor will not know who is receiving CRB-913 or placebo. All participants in Part 2 will take their assigned study tablets for 12 weeks, followed by a 28-day follow-up period after treatment ends. The information collected in this study will help determine whether CRB-913 is safe, how the body processes it, and whether it may help with weight-related outcomes.