"i love phentermine and have been taking half a tablet once a day in the mornings. so my dose per day is only 18.75 mg. i have had no side effects except weight loss (down 25 lbs in almost 5 months). my goal is nice slow steady weight loss with 80 left to go. (my thyroid was really low too and started synthroid 5 months ago. my experience with generic levothyroxine = horrible; synthroid = wonderful!) i watch what i eat and get 8 hours of sleep a night, wear a fitness tracker and walk 5 miles or more a day. i also take my bike out on trails on the weekends and ride for a couple hours. what i have noticed with phentermine that has helped me the most, is it takes away my snack cravings and real hunger. recommend half dose. perfect!"