Past, present and future-β2-adrenoceptor agonists in asthma management

Formoterol is unique in having both a long-lasting bronchodilator effect (>12h) and a fast onset of action (1-3 min from inhalation), making it effective both as maintenance and reliever medication. The recent change in classification from short- and long-acting β2-agonists to rapid-acting and/or long-acting agents reflects the ongoing evolution of β2-agonist therapy.