
I've used Vivitonin too. My Irish Setter bitch had Transient Ischaemic Attacks. Once she was on Vivitonin she was back to normal and had another good 12 months before I lost her.
Once, stupidly, I decided to stop the tablets to see how she went, and unfortunately she had another bad episode, the Vet told me that once this medication is started it must not be interrupted. It works by improving the circulation to the brain and other vital organs.
Dawn R.