My six year old daughter was prescribed omnicef for a chronic cough and some upper respiratory infections. She took this drug for ten days. She experienced some bloody diahrrea. Even after completing taking this medicine she experience having more bloody stools. The doctor tested her stool (for cultures) it came back negative. Although she tested positive for blood in her stools. They ordered more test and are possibly thinking about surgery if she does not stop bleeding everytime she has a bowl movement. I am convinced that this medicine had something to do with her bleeding. She has always had normal stools until she started taking this medicine. If anyone is experiencing this side effect well after they have stoped taking omnicef, please contact me. My 2 year old was prescribe this medicine also, he got the worse case of diarreah that I have ever seen. His bottom is still not fully recovered from the rash and it has been a month now. He had the perfect bottom. WARNING DO NOT GIVE THIS ANTIBIOTIC TO YOUR CHILD. THERE ARE WORSE SIDE EFFECTS THAT ARE NOT LISTED.