Peptobismol is good for treating gastritis caused by H.Pylori but itself causes black stools. You have to differentiate this from the black loose stools "tarry stools" which are caused by gastric bleeding. If you have visible blood in the stool, most likely this is lower GI bleeding, coming from the colorectum or anus. Persistent symptoms warrant endoscopy/colonscopy.
Answered 1/29/2022
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