"i started taking phentermine on august 3rd and i weighed in at 222.8. my last weigh in on september 14 i was 199.8. that is 22 pounds in less than 2 months. the 1st week i lost 13.6, 2nd 1.6, 3rd 3 pounds, 4th gained 1.4, 5th 3.8 lost and the 6week 2.4 lost. i exercise 4 days a week for an hour and i eat no more than 1400 calories a day. the first week and a half on the pill i had no appetite at all, i had to force myself to eat. my appetite slowly came back but it&#039;s not as bad as when i wasn&#039;t on the pill. i don&#039;t crave sweetsnor fast food. never had an issue sleeping, headaches for maybe 4 days and i was jittery the first 2 or 3 days. increase in energy was high the first couple days now it&#039;s not as high."