u/Butter-85

I’ve had 2 cats for about 12 years. They have been fed Urinary SO food for 10+ years because one cat had issues. Sadly that cat passed recently. The remaining cat has never had urinary issues. Does he need to stay on Urinary SO since he has been on it so long (and maybe his system has adjusted to it) or is it fine to switch him to a non-prescription food?