Back in June this year (2010), I started taking
Phentermine for weight loss. About a week into the treatment I had an intensely itchy hive wheal on my right hand and also itchy skin on the backs of my legs just under my buttocks. I thought it could have been a dust allergy because I know I'm allergic to dust, among many other things. I went off the Phentermine, and the wheal never went away, but it didn't bother me too much either.