Inclusion Criteria:
* Subject's written informed consent obtained prior to any study-related procedure.
* Patients aged ≥ 18 and ≤ 75 years
* Confirmed diagnosis of asthma (patients must have a documented history of asthma for at least 1 year with diagnosis before the age of 40 and/or pre-bronchodilator FEV1 between 50-80% of their predicted normal value, after appropriate washout from bronchodilators)
* Symptomatic on ICS/LABA treatment with ACT \<20
* No exacerbations in the past 3 months requiring treatment with systemic corticosteroids or emergency department visit/ in-patient hospitalization
* The ability to be trained and correctly use a pressurized Meter Dose Inhaler (pMDI) and Dry Powder Inhaler (DPI)
* To have a cooperative attitude and the ability to perform the required outcomes measurements (e.g. spirometry maneuvers in sitting and supine position) and the ability to understand the risks involved
* WOCBP fulfilling one of the following criteria:
1. WOCBP with fertile male partners: they and/or their partner must be willing to use a highly effective birth control method from the signature of the informed consent and until the follow-up visit or
2. WOCBP with physician confirmed non-fertile male partners (contraception is not required in this case).
* Female patients of non-childbearing potential defined as physiologically incapable of becoming pregnant (i.e. post-menopausal or permanently sterile, e.g. amenorrheic for ≥12 consecutive months without alternative medical cause). Permanent sterilization methods include hysterectomy, bilateral salpingectomy and bilateral oophorectomy. If indicated, as per investigator's request, post-menopausal status may be confirmed by follicle-stimulating hormone levels (according to local laboratory ranges).
Exclusion Criteria:
* Pregnant or lactating female
* Patients who had an exacerbation, defined as a sustained and acute deterioration of subject's symptoms and signs (dyspnea, cough and/or sputum production/purulence) that was either moderate, i.e. require treatment with systemic (oral/IV/IM) corticosteroids and/or antibiotics, or severe, i.e. require hospitalization, if their associated treatment/hospitalization occurred within 3 months prior to V1
* Inability to carry out pulmonary lung function testing, to comply with study procedures or with study treatment intake
* History of near fatal asthma or of a past hospitalization for asthma in intensive care unit which, in the judgement of the Investigator, may have placed the patient at undue risk
* Patients using systemic corticosteroid medication in the 4 weeks or slow-release corticosteroids in the 12 weeks, prior to screening
* Patients who suffer from COPD as defined by the current Global Initiative for Chronic Obstructive Lung Disease (GOLD) document
* History of a diagnosis of cystic fibrosis, bronchiectasis or alpha-1 antitrypsin deficiency, or any other significant lung disease which may have interfered with study evaluations
* Current smokers or current use of electronic cigarettes or ex-smokers with total cumulative exposure equal or more than 10 pack-years or having stopped smoking one year or less prior to screening visit
* Patients who had clinically significant cardiovascular condition according to investigator's judgement, such as but not limited to: congestive heart failure (NYHA class \>2), acute ischemic heart disease in the last year prior to study screening, history of sustained cardiac arrhythmias or sustained and non-sustained cardiac arrhythmias diagnosed in the last 6 months (sustained meant lasting more than 30 seconds or ending only with external action, or led to hemodynamic collapse; non-sustained meant \>3 beats \<30 seconds, and or ending spontaneously, and or asymptomatic), high degree impulse conduction blocks (\>2nd degree atrioventricular block type 2). Similarly, patients affected by persistent, long standing or paroxysmal AF were not considered for enrollment
* Patients who are unable to undergo imaging procedures for CT scans or MRI or demonstrate intolerance to Xenon gas
* Patients who have participated in a recent therapeutic trial (within past 6 months)
* Patients who have a milk protein allergy
