Budecort Inhaler contains the active ingredient budesonide, which belongs to a class of medications known as corticosteroids. Corticosteroids have anti-inflammatory properties and are highly effective in reducing swelling and inflammation in the airways, which is a key feature of asthma. By reducing inflammation, Budecort Inhaler helps to alleviate symptoms such as wheezing, coughing, shortness of breath, and chest tightness.