Clenil Modulite is classified as a preventer inhaler. It is usually prescribed to people who are in need of a reliever inhaler more than twice a week for the relief of breathing difficulties. It is also prescribed for asthma sufferers whose sleep has been disturbed more than once a week. Clenil Modulite is used regularly on a daily basis to reduce the inflammation of the lungs and prevent shortness of breath, wheezing, and asthma attacks. Breathing usually improves between three to seven days after starting the treatment. It is important that you keep using this inhaler regularly even if asthma symptoms have improved significantly. It will prevent breathing problems from coming back.