My son had been taking Renagel for the past thee years. A few months ago the dialysis center switched him to Renvela which is manufactured by the same pharmaceutical company to replace Renagel. The Renvela doesn't seem to be working as well since he is constantly itchy (which I'm told results from a high phosphorus concentration). I was going to ask his dietician about Phoslo. Would changing binders be effective in removing more of the phosphorus?