Ulimorelin is a ghrelin receptor agonist (EC50: 29 nM and a Ki of 16 nM). Ulimorelin is a prokinetic agent and causes vasorelaxation through competitive antagonist action at α1-adrenoceptors.
Capromorelin, a member of the growth hormone secretagogue (GHS) class of drugs, is a ghrelin receptor agonist and a novel therapy for stimulation of appetite in dogs with Ki value of 7 nM for hGHS-R1a and EC50 value of 3 nM for rat pituicyte. Capromorelin