I have used adipex in the past as an appetite suppressant. Initially, you will feel very speedy and it will work for a few days. However, inevitably, your body builds a tolerance and it stops working after about 2 weeks. the websites will sell it in different milligram doses, but my experience has been no matter what dosage you take, the effects wear off after 2 weeks. The theory is that in 2 weeks it shrinks your stomach and you will no longer need the supplement. If you take it for 2 weeks and go off for two weeks and then on again, you should feel the results again. I would buy a one month supply first. Note, that if you buy it via internet, you buy from an online physician who will ask you about your body weight and based on his analysis he may or may not prescribe it to you. in order to get it i believe you have to have a bmi of over 30...i could be off on that