Study Evaluating Oral MOA-728 for the Treatment of Opioid-Induced Bowel Dysfunction (OIBD) in Subjects With Chronic Non-Malignant Pain

Inclusion Criteria: * Adult outpatients with opioid-induced bowel dysfunction and chronic non-malignant pain. * Taking oral, transdermal, intravenous, or subcutaneous opioids. * Willingness to discontinue all pre-study laxative therapy and utilize only study permitted rescue laxatives. Exclusion Criteria: * History of chronic constipation before the initiation of opioid therapy. * Other GI disorders known to affect bowel transit. * Women who are pregnant, breast-feeding, or plan to become pregnant.