This study is a multicenter, double-blind, placebo-controlled, parallel-group, comparative study to investigate dose-responses of efficacy, safety, and pharmacokinetics of ASP0456 in patients with constipation-predominant irritable bowel syndrome (IBS-C) according to the Rome III Diagnostic Criteria (2006 revised edition, established by the Rome III Committee) after oral administration of ASP0456.
This study is to investigate the efficacy, safety, and plasma concentration change of ASP0456 in patients with constipation-predominant irritable bowel syndrome.