Brombuterol hydrochloride is primarily used in veterinary medicine as a bronchodilator to treat respiratory conditions in animals, particularly horses. It helps relax the smooth muscles of the airways, making it easier for animals to breathe, especially in cases of asthma, bronchitis, or other obstructive pulmonary diseases. Additionally, it has been studied for its potential effects on promoting lean muscle mass and reducing fat, though its use for such purposes is highly regulated and often prohibited in competitive sports due to its classification as a performance-enhancing drug. In some regions, its application is strictly controlled or banned due to concerns about misuse and potential health risks.