Indinaterol maleate is the drug substance for the production of indinaterol maleate inhalation aerosol prescription and indacatrogrone bromonium inhalation aerosol. Indinaterol maleate is an ultra-long-acting β 2 adrenergic (ADRB 2) agonist with oral activity. Indinaterol maleate inhibits NF-kB activity in a β -arrestin2-dependent manner, preventing further lung injury and improving lung function in COPD. Indinaterol maleate is a long-acting inhaled β adrenoceptor agonist. It can keep the muscles around the lung-airway relaxed and prevent the symptoms of COPD. After inhalation, a bronchodilator can act locally in the lung.