I AM 74. GFR was 25, creatinine 2.64. I was told to increase liquid intake to 2 liters per day. Tested again in 30 days. Results Gfr dropped to 21, creatinine rose to 3.16. Bun level is 35. I have been told to drink more water. Can I be drinking too much?

Drinking too much water would be unlikely to raise the serum creatinine and reduce the estimated glomerular filtration rate (eGFR).  I would suggest that you discuss these results with your physician.

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