Looking for a movie i watched years ago

Hey all, I'm looking for this horror/thriller movie I watched a while ago but I have limited details. I'm pretty sure the plot was that, a group of people were selected for his experiment, probably an experimental drug, and all of them had to stay in a facility together. I think they all stayed in one big room? And were allowed maybe like 1 personal item, and had to wear white gowns. Eventually they ended up going mad and killing each other. I think one of the characters was a blonde woman, she may have been the survivor, I'm not sure. They couldn't escape the facility either no matter how hard they tried