I don't know what the other part of Fen Phen is, but I found this on Fen Phen. Please read it:
http://www.adrugrecall.com/fenphen/fenphen.html
Just remember that 6 pounds a month is TOTALLY average and you shouldn't push your body to lose more then that. I know how frustrating it is because I feel compared to a lot of people on this board that I am losing weight slowly. But I also know that I am doing ti safely. The harder and longer it takes for the weight to come off the better. If it takes me two years to lose my 80 pounds I am will be much more likly to keep it off. It it only took me 5 months to lose 80 pounds then I would probably gain it all back because heck, it wouldnt take me very long to lose it again.
PLEASE be careful and research this drug your doctor gave you.