(Vetoquinol) Viralys Powder contains L-Lysine to help manage the symptoms of feline herpes virus, including sneezing, watery eyes, and nasal discharge. L-Lysine is an amino acid that has been shown to reduce the severity and duration of feline herpes virus infections. Cats remain a carrier of feline herpes virus throughout their life. Viralys Powder can help manage the condition and prevent flare-ups. Viralys Powder mixes easily with food and can be safely administered for as long as required. Each scoop provides 500 mg L-Lysine in a palatable flavor base. Give cats 1 rounded scoop twice daily. Give kittens 1/2 scoop twice daily.