Franol plus tablets contain two active ingredients, theophylline and ephedrine. These are both medicines called bronchodilators. They are used to open the airways. Theophylline causes the muscles surrounding the airways to relax by a mechanism that is not fully understood. This allows the airways in the lungs to open. Ephedrine works by acting on receptors in the lungs called beta 2 receptors. When ephedrine stimulates these receptors it causes the muscles in the airways to relax. This allows the airways to open.
In conditions where the airways tighten, such as asthma or chronic obstructive pulmonary disease (COPD, eg emphysema and chronic bronchitis) , it is difficult for air to get in and out of the lungs. By opening the airways, this medicine makes it easier to breathe.