"april 16, 2009. i have been taking phentermine for a month. when i first started to take this pill i weighed 220lbs and today i weighed in at 200lbs. this pill is the best working diet pill i have tried and i am only taking a phentermine 15.7mg. if you really want to lose weight try this pill. the only side effect i had was cotton mouth but it doesn&#039;t bother at all."