Summary
This pilot phase I trial studies how well rifaximin works in preventing infections and improving the balance of bacteria within the gut of participants with blood cancer who are undergoing blood and marrow transplantation. Rifaximin is an antibiotic used to treat intestinal infections by preventing bacteria from invading the intestinal wall. Giving rifaximin may help to prevent bacterial infections and improve transplant outcomes in participants undergoing hematopoietic stem cell transplantation.