Table 1. Functional properties of indacaterol against the three human β-adrenoceptor subtypes. From Battram et al. (7).

β1 pEC50	IA	β2 pEC50	IA	β3 pEC50	IA	Selectivity for β2 over β1
6.60±0.24	16±2	8.06±0.02	73±1	6.72±0.13	113±7	1.46

pEC₅₀ is the negative logarithm of the molar drug concentration that produces a cAMP response equal to 50% of its maximal response. IA is the percentage of isoprenaline-induced maximal response. Selectivity for β₂ over β₁ expressed as pEC₅₀ at β₂-adrenoceptor–pEC₅₀ at β₁-adrenoceptor.