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Terbutaline is a short-acting β2-adrenergic receptor (β2-AR) agonist and an active metabolite of bambuterol .[1],[2],[3] It binds to β1-, β2-, and β3-ARs (Ki = 31.3, 15.4, and 79.8 nM, respectively) and selectively increases adenylyl cyclase activity in CHO cell membranes expressing recombinant human β2- or β3- over β1-ARs at concentrations 100-fold greater than the respective Ki values.[1] Terbutaline inhibits histamine release induced by ovalbumin in isolated guinea pig lung mast cells.[2] It also inhibits airway obstruction induced by methacholine or leukotriene D4 in anesthetized guinea pigs.[4] Formulations containing terbutaline have been used in the treatment of asthma.

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