Just wanted to make you all aware of what my husband and I just went through. He has been on Tasigna since last June and recently became very weak, had very sore muscles and a rapid decline in overall wellness. I took him to the hospital and he had almost complete renal failure. He is currently on kidney dialysis and we are waiting to see how much they will recover. We also discovered that his Thyroid is destroyed. I suspect this is associated but can't confirm that. His Onc has him on a drug holiday for now because his kidneys can't process any TKI's. Please be vigilant for any serious muscle pain and stiffness, fever and dark coloured urine. Unfortunately, we chalked most of the symptoms up to Tasigna and a recent flu. There is some material out there about this as it did happen in clinical trials, but I just thought I would share our experience. Please keep in mind that this reactions is very rare. For the first six months Tasigna was very good to him and the only noticable thing was the hair loss on his legs (which we now know could by his Thyroid). He had a really good response after three months and we were very hopeful. I dont want anyone on Tasigna to panic. But I think if I had read about this before, I could have put two and two together a lot sooner.