"phentermine is the only pill that works for weight loss.. i first took it back in the 90&#039;s and i went from 251 to 143 yes over a 100 pound weight loss. at the time i saw a dr. weekly and also got a b12 shot. i had to weigh in weekly so that kept me focused.. sadly i didn&#039;t change my bad eating habits and by 2002 i was back at 211. june 2011 i was 273 pounds.so i jumped started with phentermine again but this time i only took it for about a month and use it off and on. i changed my eating habits so that i hopefully keep the weight off. the dr.i went to in 2011 james &quot;michael&quot; anchors.gives me prozac as he says that it helps the drug to work better and last longer (phenpro). i went from 273 to 173"