- Medications prior to Screening: Use of the following medications according to the following defined time intervals prior to Visit 1: Depot corticosteroids (12 weeks); Oral or parenteral corticosteroids (6 weeks); Antibiotics (for lower respiratory tract infection) (6 weeks); Cytochrome P450 3A4 strong inhibitors ( 6 weeks); Long Acting Beta-Agonist (LABA)/ inhaled corticosteroids (ICS) combination products (e.g. fluticasone/salmeterol, mometasone, furoate/formoterol fumarate, budesonide/formoterol, fumarate), If LABA/ICS therapy is discontinued completely (30 days); If discontinuing LABA therapy and switching to ICS monotherapy (48 hours for salmeterol or formoterol, 14 days for Olodaterol, Indacaterol or, Vilanterol); Use of ICS at a dose >1000 mcg/day of fluticasone propionate or equivalent (30 days); Initiation or discontinuation of ICS use (30 days); Inhaled long acting beta2-agonists (LABA): Salmeterol, Formoterol (48 hours), Olodaterol, Indacaterol and Vilanterol (14 days); Long acting muscarinic antagonists (LAMA) (Tiotropium, Aclidinium, Glycopyrronium, Umeclidinium) (7 days); LABA/LAMA combination products (Whichever mono component has the longest washout); Roflumilast (14 days); Oral beta-agonists- Long-acting (48 hours), Short-acting(12 hours); Theophyllines (48 hours); Oral leukotriene inhibitors (zafirlukast, montelukast, zileuton) (48 hours); Inhaled sodium cromoglycate or nedocromil sodium (24 hours); Inhaled short acting beta2-agonists (4 hours); Inhaled short-acting anticholinergic (short acting muscarinic antagonist [SAMA]) products eg ipratropium (4 hours); Inhaled short-acting anticholinergic/short-acting beta2-agonist combination products (SAMA/Short Acting beta2-agonists [SABA]) (4 hours); Any other investigational medication (30 days or within 5 drug half-lives)