Viralys Gel is a lysine supplement gel for cats. Viralys is recommended as an aid in the treatment of Feline Herpes Virus. Feline herpes virus is an upper respiratory virus of cats. It is also known as rhinotracheitis virus. It is very common among cats, especially in environments where there are multiple cats or new cats are constantly interacting. The virus is spread through the air and replicates in the upper respiratory tract. The gel has a palatable flavor cats will love.