Clinical efficacy and safety of fluticasone propionate 250 μg twice daily administered via a HFA 134a pressurized metered dose inhaler to patients with mild to moderate asthma

This study compared the efficacy and safety of the fluticasone propionate 125 mu g pressurized metered dose inhaler (pMDI) propelled by either hydrofluoroalkane (HFA) 134a or chlorofluorocarbon (CFC) propellants, in adult patients with asthma. HFA 134a is a non-ozone depleting propellant used as a replacement for the CFC propellants 11 and 12 which are being phased out in accordance with the Montreal Protocol. Three hundred and eighty patients with mild to moderate asthma and 'room for improvement' in their treatment were randomized to receive fluticasone propionate 250 mu g twice daily via pMDIs propelled by either CFC propellants 11 and 12 (n = 195) or HFA 134a (n = 185). Fluticasone propionate significantly improved lung function over the 4-week treatment period in both treatment groups. The improvement in mean morning peak expiratory flow (PEF) after 7 days of treatment was approximately 12 1 min(-1) in both groups, rising to approximately 22 1 min(-1) at the end of the 4-week. treatment period. The adjusted mean difference between the two formulations over weeks 1-4 was -1 l min(-1) (90% confidence interval: -7, 5 l min(-1)), confirming their equivalence. Clinical comparability was also demonstrated with respect to secondary efficacy variables, including daily symptom scares, evening PEF and clinic visit expiratory measurements. There were no clinically relevant differences in adverse events or serum cortisol levels between the two groups. The fluticasone propionate 125 mu g HFA 134a pMDI is an effective and well tolerated product and is a suitable replacement for the fluticasone propionate 125 mu g CFC pMDI at a microgram equivalent dose.