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.