A Phase 2 Pilot Study to Assess ASP7147 in Patients With Diarrhea Predominant Irritable Bowel Syndrome (IBS-D)

Inclusion Criteria: * Ability to provide written informed consent * Men or women aged 18-75 years * Patient has IBS with diarrhea (IBS-D) * Ability to communicate with the investigator Exclusion Criteria: * IBS with constipation (IBS-C) or mixed IBS (IBS-M) * Other significant disease or condition that may interfere with trial completion * Untreated lactose intolerance * History of alcohol or drug abuse in past two years * Participation in other clinical trials within prior month