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“The tarry or stickiness of the stool and the smell are what differentiate true GI bleeding from other causes such as iron supplements, dark foods, and bismuth-containing medications,” he adds.
Iron supplements may cause a grayish-black stool that should be distinguished from melena, [3] as should black coloration caused by a number of medications, such as bismuth subsalicylate (the active ingredient in Pepto-Bismol), or by foods such as beetroot, black liquorice, or blueberries.
Digested blood from the upper gastrointestinal tract may appear black rather than red, resulting in "coffee ground" vomit or melena. [2] Other signs and symptoms include feeling tired, dizziness, and pale skin color. [18] A number of foods and medications can turn the stool either red or black in the absence of bleeding. [2]
It can cause a black tongue and black stools in some users of the drug when it combines with trace amounts of sulfur in saliva and the colon to form bismuth sulfide. [7] Bismuth sulfide is a highly insoluble black salt, and the discoloration seen is temporary and harmless. Long-term use (more than six weeks) may lead to accumulation and ...
In rare cases, the drug may seriously injure the liver, and patients with symptoms including fatigue, unusual itching, nausea, vomiting, light-colored stools, dark urine, or yellow skin or eyes ...
Bleeding − bloody or black, tar-like stools, red or dark brown urine, vomiting blood or brown material that looks like coffee grounds, small, red or purple spots on skin, unusual bleeding or ...
It is also one of the medications that can cause toxic epidermal necrolysis or Stevens–Johnson syndrome. [8] The pediatric version of cefdinir can bind to iron in the digestive tract; in rare cases, this causes rust or red discoloration of the stool. Blood typically appears dark brown or black in stool, and testing may confirm which is present.
For instance, Pepto Bismol can temporarily turn stools black, as can iron supplements. ... and medications that can cause green poop include: Fiber supplements. Supplements that contain ...