Duolin (Salbutamol/Ipratropium Bromide) and Duolin Inhaler (Ipratropium Bromide/Levosalbutamol) combines 2 medicines with bronchodilative effects. They are used to treat reversible bronchospasms in patients suffering from asthma or other obstructive airway conditions, such as asthma, emphysema and brohchitis. Salbutamol (also known by its USAN albuterol) is classified as a beta 2 adrenergic receptor agonist and it works directly on the airways where it targets the smooth muscle and relaxes them. This opens up the airways. Ipratropium bromide is a type of anticholinergic medicine which works by inhibiting the muscarinic receptors in the lungs, and prevents a neurotransmitter called acetylcholine from narrowing the airways. Combining these 2 ingredients can result in improved bronchodilation compared to using just 1 of them, and physicians often recommend the use of this combination when more than 1 bronchodilator is needed.