This study is looking at the safety of using a medicine called salbutamol for asthma. Salbutamol helps people breathe easier and is given using a special spray called a metered dose inhaler (MDI). The inhaler uses a type of gas called a propellant to help deliver the medicine into the lungs. This study compares two different propellants, HFA-152a and HFA-134a, to see which one works better and is safer.

You can be part of this study if you:

• Are 18 years or older and have had asthma for at least 6 months.
• Have been taking asthma medicine regularly for the last 12 weeks.
• Have asthma that is stable and controlled, with no severe worsening in the past 6 months.

Key Points:

• The study lasts for 3 months.
• You will need to visit the study center for check-ups.
• There is a risk of asthma getting worse, so it's important to follow the study guidelines.