I tried this food after my cat did not lose weight on other prescription diets. (royalcanin.com)
As for other foods, there are other prescription diets such as Hill's that make foods for your cat's condition. (homevet.com)
I am especially loving Royal Canin's S / O index being included into other prescription diets - it gives me peace of mind to know that later in life if other problems occur, the chances of safely transitioning him to a different diet is possible! (royalcanin.com)