"i have been taking phentermine for 7 days now. started on 6/6/16 and i feel good.  love how it suppresses my appetite, gives me energy and makes me drink plenty of water.  something i had a veey hard time doing in the past.  no desire for sweets which is a great big plus for me.  i have to remind myself to eat and try to eat healthy.  the only side effect so far is dry mouth. i have noticed that i am getting cramps in places i normally don&#039;t get them. especially in my calf area during my treadmill workouts. not certain if this is from the drug or not?  never happened prior to.  i work out 3 - 4x wk cardio. advised by doc to stop weight training for awhile becuz it adds weight. that i miss. am pretty bulky in arms.  concentrating in weight."