"this medication absolutely works. it suppresses your appetite and sweet cravings. i was a eater who would eat beyond fullness and then feel awful but with this medication you will tend to eat smaller portions and can easily stop after feeling satiated. i&#039;ve also been getting the vitamin b12 injections which increases metabolism. i started phentermine 37.5 mg on july 1, 2009 weighing in at 263lbs. 2 weeks later weighed in at 250lbs. my last weigh in was july 29th, i weighed 243lbs. i&#039;ve opted to eat sugar free snacks, which i cannot tell the difference. also i&#039;ve been drinking diet soda&#039;s and plenty of water because side effects may include dry mouth and constipation. my doctor recommends 30 minutes of cardio exercises/activities three times a week."