Rex now has cushings

We have been through a lot of health issues with this being most current. He has had all the necessary tests and they are showing Cushings. My vet has been consulting with a specialist and today he started the medication. It is very rare for a bulldog to get cushings but my Rex has had everything so🤷🏻. The symptoms are excessive water drinking and urinating every 2-3 hours with many accidents inside. I am hopeful that this treatment works but I am a bit scared too. FYI The medication is called Vetoryl anyone else ever deal with this??