"i started taking phentermine 37.5mg october 18, 2017 once a day. i initially weighed in at 211lb on the date i started taking the medication. as of today november 18, 2017 i have lost 20lbs. i am down to 190lbs!!! i have completely changed my eating habits to no red meats, fried foods, starches, and i try to keep my calorie count right at 1425 per day which was difficult at first but now its much easier. i don&#039;t drink soda of coffee anymore but i&#039;m super thirsty all the time. the first weekend i took the medication it made me very jittery and i suffered from insomnia and horrible headaches. after the first four days of being on the medication my symptoms improved and eventually went away. i would recommend starting this medication on a weekend."