I started Phentermine and B-12 in Feb 2012 I lost 4lbs the first two weeks. 6.5 lbs the 2nd two weeks and none the 3rd two weeks. It then took me 3 weeks to lose 3 more lbs. I am scared to weigh myself tomorrow in fear that I haven't lost my goal is 165. I am interested in hearing how others journey has went and if phentermine will continue to work for me for at least 6 mos.