I've been giving my cats Viralys (lysine supplement) to control their herpes infection. Two tiny scoops a day into their wet or dry food. It's very effective. Moreover, it's quite tasty, so spiking their food with Viralys won't cause them to develop food aversion.

Pros: very effective for feline herpes and tastes great!

Cons: none

I use this stuff on all of my cats that come down with a URI. It helps them get over their cold and has not negative sideaffects. All you have to do is mix the perscribed amount in their wet food.

Pros: Prevents viral reproduction

Cons: have to mix it in their food

We use this all the time in the shelter for cats with URI's and it is really a great product. Nice that it is powder to put in the cats wet food and they don't even know you are giving medicine!

Pros: inexpensive and easy to give

Cons: none

I used this on stray who is now mine, he had calici virus and this helped him out, in conjuction with the care he received from his vet.

Pros: Cost effecient.

Cons: That you need it anyway.

This a great way to give Lysine to cats because of the flavoring that is added. It is more expensive than plain Lysine but easy to administer.

Pros: Tastes good

Cons: Expensive