My doctor recommended that I try a probiotic call florajen because I am hypersensitive to so many medications. some serious allergy others bad side effects. Everything from antibiotics to Pain medicines, all medicines really. I have frequent Bad UTIs and limited on the meds to use. Then they give me vaginal or mouth yeast infections. I have been on Nexium for GERD for15 yrs. also have IBS. Florajen 3 is for Gastro health also but I wondered if it will interfere with the Nexium I Have to take. The plain Floajen is for use for vaginal yeast health especially while taking antibiotics but the Florajen 3 will cover both.