Levosalbutamol (also called levalbuterol) is a short-acting beta-2 agonist bronchodilator used to relieve bronchospasm in conditions like asthma and COPD. It is the active (R)-isomer of salbutamol, offering similar bronchodilation with fewer side effects like tremors and palpitations. It relaxes the airway muscles, making breathing easier during an asthma attack or exacerbation.