KRN 4884 is an opener of the K+ channel. KRN 4884 (0.1-3 μM) activates KATP channels in a concentration-dependent manner (EC50=0.55 μM), in the presence of intracellular ATP (1 mM).
Tifenazoxide is an effective and SUR1 Kir6.2 selective KATP channels opener. Tifenazoxide has an anti-diabetic effect, can inhibit glucose-stimulated insulin release in vitro and in vivo.