"so i started the phentermine pill on a saturday, that was the first thing that hit my mouth that day. i&#039;ll be honest, it made me a little dizzy and loopy for the first couple of hours. but then all of a sudden i felt this burst of energy which makes you feel great. and i have been everyday since then...today is thursday and i&#039;ve also noticed that i&#039;m having trouble sleeping at night. i faithfully passed out around 10pm every night before i started. and now i can stay up til the next day if i wanted to. it&#039;s almost like you have to force yourself to go to sleep. since this is still my first week, i haven&#039;t recorded any weight loss yet. but i thought it would be helpful to mention the deprivation of sleep and amazing amount of energy you have"