You need to consult your vet not random strangers on the Internet that don't know your dog's medical history. If you have any concerns about the drug, ask the vet or do some Internet research.
Should dogs with Cushing's Disease do the medication Trilosane or are they better off without it?
You need to talk to a veterinary internist. If there isn't one in your town, check with your state's Veterinary college. They should have someone that can help you get the best answers for your dog. Also look online for support groups for owners of dogs with cushings, They are often a good source of articles and personal experience.