A Study to Assess the Efficacy and Safety of Budesonide/Albuterol Metered Dose Inhaler (BDA MDI/PT027) Used 4 Times Daily in Adults and Children 4 Years of Age or Older With Asthma

Inclusion Criteria: 1. Female or male aged ≥4 years at the time of informed consent 2. Physician diagnosis of asthma with a documented history of the last 6 months 3. Receiving 1 of the following inhaled asthma medications with stable dosing for at least 30 days prior to Visit 1: * Only short/rapid-acting β2-adrenoreceptor agonist (SABA) used as needed * Stable low-dose inhaled corticosteroid in addition to as-needed use of SABA 4. Pre-bronchodilator FEV1 of ≥50 to \<85% predicted normal value for adults (≥18 years of age) and ≥50% predicted normal value for subjects aged 4 to 17 years after withholding SABA ≥6 hours at Visit 1. 5. Demonstrate reversibility of airflow limitation defined as a ≥15% increase in FEV1 relative to baseline after administration of Sponsor-provided SABA (Ventolin) at either Visit 1 or Visit 1a. 6. Demonstrate acceptable spirometry performance acceptability/repeatability criteria 7. Taken Ventolin on ≥2 days out of 7 days prior to Visit 2 8. Demonstrate acceptable metered dose inhaler (MDI) administration technique as assessed by the investigator. 9. Able to perform acceptable and reproducible peak expiratory flow measurements as assessed by the investigator Exclusion Criteria: 1. Chronic obstructive pulmonary disease or other significant lung disease (eg, chronic bronchitis, emphysema, bronchiectasis with the need of treatment, cystic fibrosis, or bronchopulmonary dysplasia) 2. Systemic corticosteroids (SCS) use (any dose and any indication) within 3 months before Visit 1 3. Chronic (≥3 weeks) use of SCS within 6 months prior to Visit 1 4. Received any marketed (eg, omalizumab, mepolizumab, reslizumab, benralizumab) or investigational biologic within 3 months or 5 half-lives before Visit 1, whichever is longer, or any other prohibited medication 5. Current smokers, former smokers with \>10 pack-years history, or former smokers who stopped smoking \<6 months before Visit 1 (including all forms of tobacco, e-cigarettes \[vaping\], and marijuana) 6. Life-threatening asthma defined as any history of significant asthma episode(s) requiring admission to an intensive care unit, intubation associated with hypercapnia, respiratory arrest, hypoxic seizures, or asthma-related syncopal episode(s) within 5 years of Visit 1 7. Completed treatment for lower respiratory infection within 6 weeks prior to Visit 1 8. Upper respiratory infection involving antibiotic treatment not resolved within 7 days prior to Visit 1 9. Hospitalizations due to asthma within 6 months prior to Visit 1 10. Have taken ≥12 actuations per day of Sponsor-provided Ventolin during the run-in period prior to Visit 2 according to the below criteria: * ≥2 days out of 14 days of run-in * ≥3 days out of 15 to 21 days of run-in * ≥4 days out of 22 or more days of run-in 11. Unable to comply with study procedures including non-compliance with diary completion (ie, \<70% subject completion of diary assessments in the last 7 days preceding Visit 2 or 4-times daily dosing, \<80% compliance during the placebo run-in period). 12. Historical or current evidence of a clinically significant disease 13. Cancer not in complete remission for at least 5 years before Visit 1 14. Hospitalization for psychiatric disorder or attempted suicide within 1 year of Visit 1 15. History of psychiatric disease, intellectual deficiency, poor motivation, or other conditions if their magnitude is limiting informed consent validity 16. Significant abuse of alcohol or drugs, in the opinion of the investigator