Budesonide is a corticosteroid that acts as a powerful anti-inflammatory. It is used to treat the symptoms of allergic rhinitis (nose allergies) including stuffy, runny or itchy nose, sneezing, watery eyes, and itchy or red eyes. This leads to a reduction in the release of substances that cause allergy symptoms. Budesonide works by reducing inflammation in the nasal passages, helping to alleviate allergy symptoms such as sneezing and congestion.