Quibron

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. 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, theophylline makes it easier to breathe.