Adipex is an appetite suppressant that works by reducing the appetite. It is a doctor-approved medication for weight loss... moreAdipex is an appetite suppressant that works by reducing the appetite. It is a doctor-approved medication for weight loss and obesity. It belongs to the class of drugs called appetite suppressants as it works by increasing calorie consumption, and at the same time, it cuts back on appetite, and in the long term, it aids weight loss and keeps a check on obesity.