Elanco Secures USDA Approval for Befrena, a Breakthrough Anti-IL31 Therapy Elanco Animal Health has obtained United States Department of Agriculture (USDA) approval for Befrena, a novel monoclonal antibody injection designed to target interleukin-31 (IL-31) in dogs. Known chemically as tirnovetmab, Befrena represents a new class of dermatology treatment intended to ease the burden of canine…