I am so happy you've accessed and started your cat on the GS 441524. This sounds like a rather complicated finding and one I'm not familiar with. I would direct this question to Dr. Niels Pedersen at UCDavis. You can contact him through this link: https://www.ucdavis.edu/person/articles/1843. That said, I would absolutely continue his treatment unless Dr. Pedersen says otherwise. The fact he is improving is excellent news.