"this is my second time around with phentermine 37.5mg. 5 yrs ago i lost 38 lbs in 5 weeks. i stayed on a high protein low card diet (chicken, chicken and more chicken) and 1 pill a day, with 1 cheat meal a week. unfortunately, i gained the weight back because of self stupidity. i started again 4/5/16 with phentermine once a day with a b12 vitamin concoction injection once a week at weigh in at the doc&#039;s office. this time i&#039;m adding cardio/swimming/weight training 4 days a week. i experienced no side effects, i have no appetite, cravings and lot&#039;s of energy. i take my pill after breakfast, about 11:30/noon to ward off the late night snack attacks and still allows me to go to bed around 11pm. i highly recommend this medication."