Has anyone tried one of those weight loss pills called "Xenadrine"? It costs about $40 a bottle at GNC. I've heard from a lot of people I know that it's very effective and it doesn't make you feel "speedy" like all the other types of weight loss pills out there like Metabolife. My brother's friend lost about 20 pounds in a month with that stuff. I went out and got a bottle of it about a month ago and started taking it. It tells you to take 1 pill before breakfast and 1 pill in the late afternoon for the first week. It then tells you to increase the dosage to two pills before beakfast and two in the late afternoon. For some reason, when I take two pills during the afternoon, I feel all whacked out. (nauseated, headaches, dizzy). I'm fine in the morning though. If any of you have taken this, have you felt this way? I've stopped taken two pills now and went back to a 1 in the morning and one later during the day dose.