Vilanterol trifenatate is a pharmaceutical compound used as a component in medications for treating chronic obstructive pulmonary disease (COPD) and asthma. It functions as a long-acting beta2-adrenergic receptor agonist (LABA), which helps to relax and open the airways, facilitating easier breathing. It is typically combined with inhaled corticosteroids and is effective for long-term control of symptoms and reducing the frequency of exacerbations, but it is not intended for relief of acute symptoms.