My 6 month old daughter was on Omnicef, one dose a day for 10 day...

My 6 month old daughter was on Omnicef, one dose a day for 10 days. The seventh day she had completely maroon colored stool. This can be alarming because you are immediately going to think blood. The doctor said that Omnicef reacts with iron and causes this color. So I think because many 4+ month olds are on iron fortified formulas or cereals this side effect should be told the the parent filling the prescription for their child. We continued the prescription and she had no other ill side effects. She remained her happy go lucky self and it has been a week since the last dose.