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Saeedi et al., 2008
Black and tarry stools may also occur due to: Abnormal blood vessels in the esophagus, stomach, or duodenum A tear in the esophagus from violent vomiting (Mallory-Weiss tear) Blood supply being cut off to part of the intestines Inflammation of the stomach lining (gastritis) Trauma or foreign body Widened, overgrown veins (called varices) in the esophagus and stomach, commonly caused by liver cirrhosis Cancer of the esophagus, stomach, duodenum, or ampulla of Vater When to Contact a Medical Professional Contact your health care provider right away if: You notice blood or changes in the color of your stool You vomit blood You feel dizzy or lightheaded In children, a small amount of blood in the stool is most often not serious
By contrast, retatrutide has no approved brand name and no formulation is approved for any indication anywhere in the world as of June 2026
Lawsuits claim the manufacturer knew or should have known about these risks and failed to adequately warn patients and doctors, forming the basis for failure to warn legal claims
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