I was amazed by other parents entries on the side effects of Omnicef. My 6 year old son Matthew has had the exact same side effects! Hives that look like he was lashed, horrible stools, etc. He has Autism, so you can imagine how horrible this was for his emotions. I discovered this website today and have immediately stopped the medication. He was taking this for Sinititus. I definitely will be spreading the word on these side effects to other parents!