Overview Efficacy and Safety of Oral Rifaximin in Patients With Active Microscopic Colitis Status: Recruiting Trial end date: 2021-12-01 Target enrollment: Participant gender: Summary This is an open label study looking at rifaximin therapy for the treatment of microscopic (collagenous or lymphocytic) colitis. Phase: Phase 2 Details Lead Sponsor: Eugene F Yen, MDTreatments: Rifaximin