Formoterol and salmeterol induce a similar degree of ?2-adrenoceptor tolerance in human small airways but via different mechanisms.
Cooper PR, Kurten RC, Zhang J, Nicholls DJ, Dainty IA, Panettieri RA. Formoterol and salmeterol induce a similar degree of ?2-adrenoceptor tolerance in human small airways but via different mechanisms. Br J Pharmacol. 2011 Jun; 163(3):521-32.