Study finds novel drug effective for functional constipation July 13, 2011 Overview Show transcript Overview Affecting nearly 30 million Americans, constipation increases health care costs and diminishes quality of life. Banny S. Wong, M.D., of the Department of Gastroenterology and Hepatology, discusses a phase II study of A3309, an ileal bile acid transporter blocker. Study results are promising, showing faster transit times, softer stools and improved ease of passage with few side effects. Receive Mayo Clinic news in your inbox. Sign up Related Content Q and ADiagnosis and management of patients with chronic constipationArticleUnderstanding the needs and burdens of patients with CIC and IBS-C VID-20433424 Medical Professionals Study finds novel drug effective for functional constipation