Taking antibiotics for an infection might cause antibiotic-associated diarrhea, a common condition that is easily treated. While blood in stool can signal a serious problem, it doesn't always. Here's what you need to know about the possible causes of bloody stools and what you -- and your doctor -- should do if you. I took Augmentin for a toothache on 2-2-2016; 1 tab every 8 hours for 10 days. My stomach started hurting first, then my urine turned dark like root beer, I had bloody stool and threw up blood, my eyes turned.I was diagnosed with cirrhosis to my liver. Antibiotics, Diahrrea, and bloody stool jbunton444 Hello, in Dec. 2010 I got a pres for Levaquinn 500 and took this until around , the sinus infection did not subside (I took levaquinn probably 2 - 2 1/2 years before always for sinus too). In the last two days i have observed blood in my stool along with some saliva like stuff coating it. Bowel movements are painless and i have constant urge to got to the toilet frequently. Antibiotic-associated diarrhea refers to passing loose, watery stools three or more times a day after taking medications used to treat bacterial infections (antibiotics). Most often, antibiotic-associated diarrhea is mild and requires no treatment. We had DS tested for C Diff at one point after his bloody stools worsened because of amoxicillan. The ped was sure it wasn't C Diff, but tested anyhow and it was negative. Hello, Most of the breast-fed babies develop lactose intolerance which usually self corrects but not always if it is a cow milk or a formula milk problem or allergy/intolrance with some dietary ingredient. If you are taking an antibiotic, the medication will cause a mild change in your population of intestinal bacteria that may cause occasional loose stools or mild diarrhea for a few days. These symptoms should stop once your antibiotic treatment ends. Note: This document contains side effect information about amoxicillin / clavulanate. Some of the dosage forms listed on this page may not apply to the brand name Augmentin.