Racehorse welfare is shaped not only by training and racing conditions but by medication practices that affect horse health and performance. Understanding medication regulation is essential for the welfare picture of horse racing.
Horse racing medication regulation is a welfare issue because medications that mask pain, enhance performance, or suppress injury signals allow horses to race in conditions that cause or worsen injury. The use of furosemide (Lasix) to reduce exercise-induced pulmonary hemorrhage is the most common therapeutic intervention, and its welfare implications are contested. More serious welfare concerns arise from pain medications that allow horses with injuries to compete, potentially worsening damage and increasing catastrophic breakdown risk. The international divergence in medication policy — with the US historically more permissive than European racing — has been a persistent welfare and integrity concern. HISA's creation of federal oversight represents significant regulatory progress; its implementation and enforcement will determine whether it produces genuine welfare improvement.