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Dynogen Pharmaceuticals, Inc. announced today that it has initiated a Phase II proof-of-concept trial of DDP225 for diarrhea-predominant irritable bowel syndrome (IBS-d), and the first patients have been dosed. DDP225 is an orally-active compound that targets two key pathways that control the gastrointestinal (GI) system, thus giving it the potential to address multiple symptoms associated with IBS-d. This DDP225 Phase II trial is a randomized, double-blind, placebo controlled study that is enrolling patients with IBS-d at multiple centers in Canada and is assessing safety and pharmacodynamic efficacy as well as symptom-based endpoints. In September 2005, Dynogen began dosing patients in a Phase II study of DDP733 for the treatment of patients with constipation-predominant IBS (IBS-c), the other common form of IBS.