@njh I did the same thing as you! I put myself on a renal diet while still at a high Stage 3 level. My drs said it wasn't needed, but I wanted to slow progression of CKD. I knew the cause of my CKD would lower my function slowly, so I gave up potatoes, oranges, bananas, tomatoes to start with, and worked into following a renal diet. I am Stage 4 now, at 22% function. And like you, all medications are weighed against on renal interaction. I am on Gabapentin, but take only 200 mg per day, to ease kidney effect, rather than 3000mg a "normal" person can take!
Ginger