"i started using phentermine for the first time 3 days ago. i have zero appetite and trouble sleeping. also dry mouth. this pill has given me tons of energy. i lost 120lbs over the past 4 years on my own. since having two surgeries i put on around 25 to 30lbs. i started out monday 8/14/17 weighing 166. i will see my dr in a month. i am 5&#039;4 female and i&#039;m 33 years old my ideal weight by the dr is between 108 and 145. i have been 166 lbs for a while and it doesn&#039;t look that great on me. i felt comfortable at 145 so that my goal. so that&#039;s about 20lbs that i need to loose."