Cat is on renal diet, is there a pill alternative?

My cat has CRF, and we have him on a diet that involves spreading a powder medication on his food three times a day. The problem is that we have two other cats who we don't want taking his supplements from him by mistake. Right now we have him on Renal Advanced for cats by Candioli Farmaceuti (I assume the meds are imported for whatever reason). Is there a pill form of the medication that we can give him?