Patient description: A 39-year-old man came to the clinic with cough and shortness of breath that was not relieved by his inhaler. He had these symptoms for 5 days during the past 2 weeks. He doubled his oral corticosteroids in the past week. He is a chef with a history of asthma for 3 years, suffering from frequent cough, wheezing, and shortness of breath and chest tightness. The symptoms become more bothersome within 1-2 hours of starting work every day and worsen throughout the work week. His symptoms improve within 1-2 hours outside the workplace. Spirometry was performed revealing a forced expiratory volume in the first second (FEV1) of 63% of the predicted. His past medical history is significant for seasonal allergic rhinitis in the summer. He doesn't smoke or use illicit drugs. His family history is significant for asthma in his father and sister. He currently uses inhaled corticosteroid (ICS) and fluticasone 500 mcg/salmeterol 50 mcg, one puff twice daily.

Clinical trial eligibility criteria: eligible ages (years): 18.0-60.0,  Bioequivalence Healthy volunteers of both genders, aged ≥18 and ≤60 years Subjects with Body Mass Index (ΒΜΙ) ≥18.5 and <30.0 kg/m2 Healthy volunteers are declared healthy based on medical history, physical examination, ECG, pulmonary function test (a forced expiratory volume in 1 second (FEV1) ≥80% of the predicted normal value), and clinical laboratory values within the laboratory stated normal range; if not within this range, they must be without any clinical significance according to the Investigator Females who participate in the study are either at reproductive age i.e.pre-menopausal or unable to gestate [i.e. post-menopausal (absence of menses for 12 months prior to drug administration), hysterectomy, bilateral oophorectomy, tubal ligation at least 6 months prior to drug administration] Subjects that are non-smokers Subjects that, in the opinion of the principal investigator/medical officer, are able to communicate and comply with the study procedures and protocol restrictions as evidenced by the Informed Consent Form (ICF) duly read, signed and dated by the subject prior to study initiation Subjects able to use the inhalers according to given instructions, as judged by the Investigator or study nurse  Hypersensitivity to the active substance(s) or to the excipient (lactose which contains small amounts of milk protein may cause allergic reactions) or related class (any sympathomimetic drug or any inhaled, intranasal, or systemic corticosteroid therapy) of the medicinal product Clinically significant illness or surgery within four weeks prior to dosing Clinically significant ECG abnormalities or vital sign abnormalities (seated systolic blood pressure <90 or >140 mmHg, seated diastolic blood pressure <50 or >90 mmHg or heart rate less than 50 or over 100 bpm) at screening Clinically significant history or presence of chronic bronchitis, emphysema,asthma or any other lung disease History or presence of pulmonary tuberculosis Viral or bacterial, upper or lower respiratory tract infection or sinus or middle ear infection within 4 weeks prior to the screening visit History or presence of significant cardiovascular, endocrinal, neurologic, immunological, psychiatric or metabolic disease History of significant alcohol or drug abuse within one year prior to the screening visit Regular use of alcohol within six months prior to screening visit (more than 14 alcohol units per week) [1Unit =150 ml of wine, 360 ml of beer, or 45 ml of 40% alcohol]. Inability to abstain from alcohol for the duration of study period Presence of disease markers for Hepatitis B, Hepatitis C or HIV at screening