At the clinic, groups of five veterans at a time received ibogaine pills, up to a maximum of 14 milligrams per kilogram of body weight, over three hours. Wearing eyeshades, they each lay on a mat, spread out across a large room, as the effects set in. Beforehand, participants had been coached about what to expect during the trip, which could last up to 72 hours, and they were supervised by medical staff throughout.
