- Reversibility of disease: The patient has demonstrated at least 12% reversibility of FEV1 and at least 200 mL increase from baseline FEV1 (patients age 18 and older) within 30 minutes after 2-4 inhalations of albuterol/salbutamol hydrofluoroalkane (HFA) MDI (90 mcg ex-actuator) or equivalent at the screening visit