My eight month old son was prescribed Omnicef for a double ear infection and possible strep throat. After one dose of the medication, he has had several bouts of rust-colored diarrhea which could be mistaken for blood. Since there is nothing in his diet that could turn his stool this color, I assumed it was the Omnicef. I called the pharmacist to see if there was a red dye in the medication, but he insisted that this was an abnormal occurrence. The pediatrician told us that it does contain a red dye. My son has been irritable, clingy, restless, and is displaying anxious behaviors. He is not sleeping well. I can only attribute it to the medication, as his ears and throat are getting much better. I still have another 6 days left of this; if it continues for another day, I will stop.
To those of you who are continuing to give/take this med, I have split the dose into two and this seems to be helping. I give it in the morning and evening after a full meal. The diarrhea is less frequent and less watery.
This website was the only thing verifying my experience. Thank you to everyone who has contributed their insights.