Qvar aerosol contains beclometasone dipropionate which belongs to a group of medicines known as corticosteroids qvar aerosol is used to prevent the symptoms of mild moderate and severe asthma in patients who require regular treatment qvar aerosol works deep in your lungs to make breathing easier for you by reducing the inflammation swelling and irritation in the airways this type of medicine is known as a preventer it needs to be taken regularly every day even if you have no symptoms