Salbutamol, also known as albuterol and marketed as Ventolin among other names, is a medication that opens up the medium and large airways in the lungs. It is used to treat asthma, exercise-induced bronchospasm, and chronic obstructive pulmonary disease (COPD). It may also be used to treat high blood potassium levels. It is usually used by inhaler or nebulizer but is also available as a pill and intravenous solution. Onset of action of the inhaled version is typically within 15 minutes and lasts for two to six hours.