Background and objectives: About 358 million people have asthma. The main way to treat asthma is with inhalers. Non-adherence to asthma treatment has been linked to more hospital and emergency room visits, more illness, and more money spent on things that aren't necessary. For asthma to be managed well, people need to take their medicine as prescribed. The main goal is to find out which inhaler is best for treating bronchial asthma.