Red coloration, similar to fresh blood |
Certain antibiotics* |
Beets |
Flavored gelatin (red colored) |
Kool-Aid or fruit punch (red colored) |
Red licorice |
Red-dyed snack foods (eg, spicy "red-hot" snacks) |
Black coloration, similar to melena |
Bismuth preparations (Pepto-Bismol, Maalox, Kaopectate) |
Iron supplements¶ |
Activated charcoal |
Chocolate |
Black licorice |
Blueberries |
Large quantities of some dark green foods |
False-positive results to fecal occult blood test |
Rare red meat |
Peroxidase-containing vegetables (turnips, horseradish, broccoli, cauliflower, and cantaloupe) |
* Several reports have described cases of very red-appearing stools associated with cefdinir, apparently caused by an interaction with iron supplements or iron-containing infant formula[1-3]. Rifampin can cause orange discoloration of stools as well as urine. Other antibiotics in red vehicles (eg, cherry syrup) may cause a red tint to the stool, especially in infants or others with a fast transit time. Antibiotics can also trigger true gastrointestinal bleeding (Clostridioides difficile colitis). Therefore, red-appearing stools should be evaluated with guaiac or other tests for blood.
¶ Whether iron supplements cause false-positive results for fecal occult blood testing is controversial.Do you want to add Medilib to your home screen?