Quick view Enisyl-F (L-Lysine) Oral Paste for Cats 100ml (1) MSRP: $68.99 Enisyl F is an oral paste L-Lysine HCI Nutritional Supplement for cats. Enisyl-F is used for treatment of Feline Herpes Virus (FHV-1). EnisylF is a palatable lysine base that comes in... Trustpilot Add to Cart Add to Cart