Abstract: Feline herpesvirus (FHV-1) is a highly contagious virus affecting domestic and wild felines and is the leading cause of corneal disease and conjunctivitis in cats. Thus, provided herein is topical ophthalmic formulation for treating FHV-1, comprising L-lysine and a second therapeutic agent, such as osha root (e.g., ligustilide). The formulation enables direct and concentrated delivery to the ocular surface, which is believed to enhance efficacy in treating herpesvirus infections. This innovative approach improves treatment outcomes by targeting the virus more effectively at the site of infection.