"started phentermine a week ago.  the first day i literally felt crazy. i was hot, sweaty and extremely active, water was my best friend! now i just feel energized, not crazy lol. i don&#039;t have an appetite at all and if i go without water i get headaches (shocker).  i take it everyday with the exception of sunday&#039;s, i know i won&#039;t drink alot of water but i still maintain my eating habits. i&#039;ve been on if for a week now and i started at 189 and today i weighed 181, so 8lbs today. i think it&#039;s great, best decision i&#039;ve made so far, gonna give another update in a month."