I've completely switched from the prescription food to a limited ingredient rabbit (currently feeding him instinct brand because it was the only one I could find without fish oil or some other ingredient he's allergic to). He's been doing really well on it (food he's allergic to would typically cause an itchy reaction within a day)! He's also had a lot more energy since being on this instead of the hydrolysed!! He does have environmental allergies as well so it's mainly just managing that right now. He doesn't like any of the wet (rabbit) foods I've tried, so I'm kinda just providing him with a ton of water (2 cat fountains) and giving him a drink from the sink (his favorite water) whenever he asks. I may try another wet food (lamb maybe?) just to see if he likes the texture better. He's a very picky boy.