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How long to transition my picky cat to a kidney diet with stimulant?

Updated on September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 18 years and 9 months old | 9.5 lbs

Hi for the past 7 days I’ve been transitioning tony to a kidney diet with the help of 1/8 mirtazapine appetite stimulant every 48 hours. Today on day 7, I was told to try 100% kidney food (none of his senior diet mixed in) and he’s acting picky with it, not cleaning his bowl like he has the past 6 days with his old senior diet and kidney food mixed. Even with the appetite stimulant should I expect it to be a longer transition period? thx!

1 Answer

Most Helpful Answer

Lindsey Edwards MVB, BSc, IVCA

Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on October 6th, 2018

Yes, by its nature kidney diets tend to be less enticing than other ranges (being lower in salt etc) and can take some time to gain full acceptance. As long as he has no gatrointestinal side effects and is eating more than 75% of recommended amount I would not be overly concerned but any less than this I would continue with the mixed diet and gradually reduce the last stage over 2-3weeks. Kidney diets are extremely effective, and although less than ideal, a mixed senior/kidney diet is still helpful (unlike many prescription foods which should be fed exclusively)
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