Kitty Distempaid, when used in conjunction with Vibactra Plus, is the only product commercially available I have ever found that is actually effective for treating distemper in kittens and cats. It works very well if the cat starts taking it at the onset of symptoms, and works well as a preventative if used on cats and kittens that have been exposed to the distemper virus. It will save you hundreds of dollars in largely ineffectual veterinary treatment, and is great for rescues and shelters to keep on hand. I highly recommend it. This product also works well in treating diarrhea in cats and kittens.