Albuterol is used in horses for its effects on bronchial smooth muscle to alleviate bronchospasm or cough. Recurrent airway obstruction, often called heaves, results from environmental sensitivity to airborne particles (molds, pollen, mites), and can by exacerbated by stress. Exposure to foreign airborne particles can cause persistent airway inflammation. Albuterol (5 mg/ml) by NexGen works by relaxing the muscles of the airway to improve breathing.