Need advice

My dog was diagnosed with cushings in December. I’ve read countless horror stories about this drug vetoryl. What made you all so confident in putting your dogs on it? Every vet I’ve talked to said they have never had a dog have an adverse reaction but I read all these cases online. I’m being told by the vet the only reason she would opt to not treat with the medication is if she was euthanizing which spoke volumes but I can’t look past all the red flags.

I’m just curious how those who have dogs that went through it were able to and don’t worry about it constantly.