Y-26763 is an active metabolite of Y-27152. Y-26763 is the novel K channel opener. It has been found to activate K channels in both cardiac myocytes and in smooth muscle cells from various tissues, suggesting that the compound has a non-specific effect on SUR1 and SUR2 channel subunits. Y-26763 well tolerated in healthy volunteers, and its pharmacologic effects were likely caused by vasodilation, which could make it an effective antihypertensive agent. At doses of 0.5 mg or higher, participants experienced headaches and palpitations, which were probably due to the vasodilatory effects and did not require treatment. Y-26763 partially protected against glycerol-induced acute renal failure. Also, it reduces infarct volume in focal cerebral ischemia in rats.