Fecal Microbiota Transplantation for IBS

Inclusion Criteria: * IBS defined by Rome IV criteria * Non IBS-C * Moderate to severe symptoms defined by IBS-SSS≥175 * Able to safely undergo and consent to colonoscopy Exclusion Criteria * Immune deficiency or treatment with immunosuppressive medications * Severe bowel or medical disease precluding administration of bowel prep * Severe bowel or medical disease precluding colonoscopy with conscious sedation * Active cancer * Pregnant or lactating * Abdominal surgery (exception of splenectomy, partial hepatectomy, partial/unilateral nephrectomy, laparoscopy, pelvic floor repair, mesh, liposuction, fundoplication, tubal ligation, gastric sleeve, oophorectomy, hernia, appendectomy, cholecystectomy, caesarean section and hysterectomy) * Severe psychiatric disorder (HADS-A or D\>16), or diagnosed alcohol or drug abuse disorder * New probiotics or treatment with antibiotics, NSAIDs (within 4 wks prior to study entry) * Use of treatments known to affect colonic motility (with exception of loperamide) * Diagnosed h/o bleeding disorder * Organic GI diseases (IBD, celiac disease, microscopic colitis) * Chronic kidney or liver disease * Absolute neutrophil count (ANC) \<500 IU/ml