Vidaza is given based on body weight. I get two injections of Vidaza each day for the seven days, and have them split into two areas. R and L Abdomen day one, R and L upper arm day two and repeat for the seven days. I have tried both injections one location each day, rotating between abdomen and upper arms, which results in slightly more localized inflammation at that site than splitting the sites. Either way my abdomen gets quite red and sore. The disadvantage of both in the same site for me is I get a rash on the back of my thigh if both injections go into my L abdomen on the same day. If I split one R and one L, no rash. Since abdomen has more room, I prefer the injections there. But not room for seven days of injections in abdomen alone. Back of arms don’t get as red as my abdomen, but they do get very sore.