I just started taking Phentermine 37.5 Friday March 21st, 2014. I weighed 176 when I started. Since Friday, I have lost 8 pounds. So that is like 8 pounds in 3 days. I now weigh 168. I do not exercise and only drunk one glass of water. I have really sat on my butt since starting this medicine. The only side affect I have is getting a dry mouth closer to night. I still drink around 4 to 5 sodas a day and that is the only thing I drink. The only difference I have made since starting this medicine is not eating as much because it suppresses my appetite.