The respiratory tract is one of the oldest routes used for the administration of drugs. Over the past decades inhalation therapy has established itself as a valuable tool in the local therapy of pulmonary diseases such as asthma or COPD (Chronic Obstructive Pulmonary Disease).This type of drug application in the therapy of these diseases is a clear form of targeted drug delivery to lungs.The drug used for asthma and COPD eg.- β2-agonists such...