A Multicenter, Double-Blind, Randomized, Placebo-Controlled, 12-Week, Dose-Range-Finding Trial of YKP10811 Capsules Administered Once Daily to Subjects With Chronic Idiopathic Constipation

This will be a multi-center, randomized, double-blind, placebo-controlled study of YKP10811 capsules in patients with chronic idiopathic constipation. Following a 2-week baseline period, approximately 320 eligible patients with \<3 complete spontaneous bowel movements (CSBM) and ≤ 5 SBMs per week will be randomly assigned equally to receive one of the following oral treatments; placebo or YKP10811 capsules once daily for 12 weeks followed by a 2 week follow-up period. The objectives of this study are: * To assess the efficacy of YKP10811 once daily at relieving constipation and associated symptoms in subjects with chronic idiopathic constipation. * To determine the safety and tolerability of YKP10811 once daily in subjects with chronic idiopathic constipation.