"female 40yrs old, 5&#039;3&quot;. i&#039;ve started phentermine 37.5mg friday july 8, 2016. starting weight 200.4.  today july 10, 2016, i am down to 196.4. i&#039;ve lost 4 pounds. i&#039;m sure is water weight, as i&#039;ve increased my water intake my 90%. it suppresses my appetite, but couldn&#039;t sleep first night. i find to get a headache mid afternoon 2-3pm. i take it at 830am. take excedrin, and all is well. i&#039;d like to get to 170 first goal, 160 2nd goal, and then finally 150. so far those are the only side effects i&#039;m experiencing. i&#039;m not counting calories, but am watching what i eat and drink only water, and exercise hr 3 days week, plus daily housework. i also have a kitten that&#039;s very hyper and keeps me active. lol. good luck to everyone&#039;s weight loss!"