Hi, my name's Dawn (Cancer survivor) and I finally joined about a week ago and you guys are really a great motivation to me. My sister took phen and lost alot of weight so I'm going to try now so wish me luck. I just gained so much weight during my treatment on top of the weight that I already needed to lose because of the steroids I had to take but, I'm finished with all that now so lets get started. Hey, I was also trying to find out about how long do u have to take phen b4 it starts to really work and u actually c results? And does any one in here have hypothyroid and if so does the phen affect u an anyway?