Can antibiotic Cefdinir cause maroon stools ? I once had Cefdinir and it caused my stool to turn maroon with red blood tinge to it. I gave the same stool sample to the lab for testing for Stool R/M and occult blood and the results came out to be negative. I am attaching both the reports for your perusal please. Actually I was taking cefdinir and on that very day I also had Munakka raisins. So can it happen ? Have you witnessed such cases where patients complain the same after consumption of above named drug ? This incident occurred in 2018 but I thought that I should ask well qualified doctors on practo go can give me a genuine answer.