Symbicort is a combination inhaler used as a first-line maintenance therapy for moderate to severe asthma. It contains budesonide (a corticosteroid that reduces airway inflammation) and formoterol (a long-acting bronchodilator that quickly relaxes airway muscles). Its unique feature is that formoterol acts rapidly, allowing Symbicort to be used both daily and as-needed in some treatment plans (SMART therapy).

It helps prevent asthma attacks, improves breathing, and reduces the need for separate rescue inhalers. Symbicort is generally well tolerated, with possible side effects including throat irritation, hoarseness, and oral thrush (which can be reduced by rinsing after use).