Budesonide is used to control and prevent symptoms (wheezing and shortness of breath) caused by asthama. It works directly in the lungs to make breathing easier by reducing the irritation and swelling of the airways also used to treat various respiratory diseases like allergic rhinitis (an allergy that causes itchy, watery eyes and sneezing), COPD (Chronic Obstructive Pulmonary Disease, a lung disease that blocks airflow and causes difficulty breathing). side effect of this medicine are Indigestion,Headache,Abdominal pain,Nausea,Bloating,Constipation,Gas,Vomiting,Stuffy nosee,Weakness/tiredness