A Study to Compare the Relative Potency of Salbutamol Administered Via Metered Dose Inhalers (MDI) Containing Propellants HFA-152a to HFA-134a in Mild Asthmatics Aged 18 to 65 Inclusive

This study is comparing two versions of a common asthma reliever inhaler (salbutamol, also known as albuterol) that use different propellant gases — one older formulation and one newer, more environmentally friendly option — to see if they work equally well for people with mild asthma. **You may be eligible if...** - You are between 18 and 65 years old - You weigh at least 50 kg and have a BMI between 19 and 35 - You have had asthma for at least 6 months - You are currently on a stable, low-dose asthma treatment (either a short-acting reliever only, or a low-dose inhaled steroid with or without a reliever) - Your treatment dose has been stable for at least 12 weeks **You may NOT be eligible if...** - You have moderate or severe asthma requiring higher-dose medications - You have other significant lung, heart, or other health conditions - You are pregnant or breastfeeding - You have had a severe asthma attack requiring hospital care recently Talk to your doctor to see if this trial is right for you.