Inclusion Criteria:
- Participants with a diagnosis of asthma, for a period of at least 1 year prior to Visit 1 (Screening)
- Participants who have used medium or high dose inhaled corticosteroids (ICS) or low dose of long acting beta-2 agonist (LABA)/ICS combinations for asthma for at least 3 months and at stable doses for at least 1 month prior to Visit 1
- Participants must have ACQ-7 score ≥ 1.5 at Visit 101 and at Visit 102 (prior to double-blind treatment) and qualify for treatment with medium or high dose LABA/ICS
- Pre-bronchodilator ≥ 50% Forced expiratory volume in 1 second (FEV1) of < 85 % of the predicted normal value for the participants after withholding bronchodilators at both Visit 101 and 102, according to American Thoracic Society/European Respiratory Society (ATS/ERS) criteria.
- Withholding period of bronchodilators prior to spirometry: short acting beta-2 agonist (SABA) for ≥ 6 hours and FDC or free combinations of ICS/LABA for ≥ 48 hours, short acting anticholinergics (SAMA) for ≥ 8 hours, xanthines >=07 days
- A one-time repeat/re-testing of percent predicted FEV1 (prebronchodilator FEV1) is allowed at Visit 101 and at Visit 102.
Spacer devices are permitted for reversibility testing only.
-Participants who demonstrate an increase in FEV1 of 12% and 200 mL within 30 minutes after administration of 400 µg salbutamol/360 µg albuterol (or equivalent dose) at Visit 101 All participants must perform a reversibility test at Visit 101
If reversibility is not demonstrated at Visit 101:
- Reversibility should be repeated once-
- Participants may be permitted to enter the study with historical evidence of reversibility that was performed according to ATS/ERS guidelines within 2 years prior to Visit 1
- Alternatively, participants may be permitted to enter the study with a historical positive bronchoprovocation test that was performed within 2 years prior to Visit 1.
Exclusion Criteria:
- Participants who have smoked or inhaled tobacco products within the 6 month period prior to Visit 1, or who have a smoking history of greater than 10 pack years. This includes use of nicotine inhalers such as e-cigarettes at the time of Visit 1
- Participants who have had an asthma attack/exacerbation requiring systemic steroids or hospitalization or emergency room visit within 6 weeks of Visit 1 (Screening)
- Participants who have ever required intubation for a severe asthma attack/exacerbation.
- Participants who have a clinical condition which is likely to be worsened by ICS administration (e.g. glaucoma, cataract and fragility fractures) who are according to investigator's medical judgment at risk participating in the study).
- Participants who have had a respiratory tract infection or asthma worsening as determined by the investigator within 4 weeks prior to Visit 1 (Screening) or between Visit 1 and Visit 102. Participants may be re-screened 4 weeks after recovery from their respiratory tract infection or asthma worsening.
- Participants with a history of chronic lung diseases other than asthma, including (but not limited to) Chronic Obstructive Pulmonary Disease (COPD), sarcoidosis, interstitial lung disease, cystic fibrosis, clinically significant bronchiectasis and active tuberculosis.
- Participants with severe narcolepsy and/or insomnia.
- Participants who have a clinically significant electrocardiogram (ECG) abnormality at Visit 101 (Start of Run- In epoch) and at any time between Visit 101 and Visit 102 (including unscheduled ECG). ECG evidence of myocardial infarction at Visit 101 (via central reader) should be clinically assessed by the investigator with supportivedocumentation
- Participants with a history of hypersensitivity to lactose, any of the study drugs or to similar drugs within the class including untoward reactions to sympathomimetic amines or inhaled medication or any component thereof
- Participants who have not achieved an acceptable spirometry results at Visit 101 in accordance with ATS/ERS criteria for acceptability and repeatability (rescreening allowed only once).
Repeat spirometry may be allowed once in an ad-hoc visit if the spirometry did not qualify due to ATS/ERS criteria. If the participant fails the repeat assessment, the participant may be rescreened once
- Participants on Maintenance Immunotherapy (desensitization) for allergies or less than 3 months prior to Visit 101 or participants on Maintenance Immunotherapy for more than 3 months prior to Visit 101 but expected to change throughout the course of the study.
- Women of child-bearing potential, defined as all women physiologically capable of becoming pregnant, unless they are using highly effective methods of contraception during dosing of study treatment and for 30 days after stopping of study treatment.
- Long acting muscarinic antagonist (LAMA) use within 3 months prior to Visit 101