I've been on Phentermine 15mg for 15 days now and have lost about 12 lbs. When I first began, I took only 1 in the morning. Now, I take 1 in the morning and 2 in the afternoon (which is what my doctor prescribed me). It took a little while to get used to. My main side effect was the insomnia! I try to make sure I take the afternoon dose no later than 2pm so that I can sleep. Now I only have the sleep problems if I forget my afternoon dose and take it after 3pm. I've lost the jitters too, which is good, but that didn't really bother me because I used to drink a lot of coffee (which I no longer do) I just feel normal now and without any hunger 
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