Budesonide is a medication that belongs to a class of drugs known as corticosteroids. It is commonly used to treat conditions like asthma and allergic rhinitis by reducing inflammation in the airways. Budesonide can be administered through inhalers, nasal sprays, or oral capsules, depending on the condition being treated. This medication works by suppressing the immune response and decreasing the production of inflammatory substances in the body. While effective for managing symptoms, it is important to use budesonide as prescribed, as long-term use can lead to side effects such as weakened immune function and potential growth suppression in children.