What do the doctors have to say?

There are no long term clinical trials using phentermine. In all the fifty years of sale, research has focussed on short-term use. So people put on weight over years and then scientists study how a few weeks with a drug affects them. This is not a very sensible strategy. Doctors therefore have to rely on their patients to tell them how good phentermine is. The experience on the ground shows patients have always come back for more. If there were bad experiences and weight stayed put, phentermine would have died on the vine years ago. Poor performers do not survive in this global market where the internet brings bad news faster than a speeding bullet.