Hi Steven,
As Neil already told you Vidaza is different from Dacogen but Vidaza is supposed to be a better choice for more patients. Vidaza often initially decreases HGB.
http://www.rxlist.com/vidaza-drug.htm
It is really too early to know if your father is one of the about 50% that responds to Vidaza - as Ann reported many patients need more supportive therapy during the first cycles.
Kind regards
Birgitta-A