Drug delivery by inhalation of various medications is the most common treatment approach for asthma in all patient populations. Inhalation therapy offers rapid onset and improved efficacy compared to systemic drug delivery (Bisgaard, 1997). While ICS therapy is well accepted as the foundation of optimal therapy for most asthma patients, efficacy of the therapy depends on drug being delivered correctly into the lungs and taken on a regular basis as a preventer therapy (Machira et al., 2011).