Does Omeprazole Cause Dark Colored Stools?
not a known side effect
Detailed Answer:
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This medication is not known to have this side effect. It can occur with pepto bismol or iron supplements but it is not known to be a side effect of omeprazole.
If you are not currently using pepto bismol or iron supplements then it may indicate, that though there was no bleeding when you were seen before, there may be a small amount at the moment and you may need to be re evaluated especially with a history of severe abdominal pain
Normally a diagnosis of bleeding or not bleeding is based on the appearance of the stool or blood in the vomit.
You may have reported to the attending doctor that your stools were normal at the time, but with this change in color, the final diagnosis of ulcer with no blood or acute gastritis with no bleeding would need to be modified.
Imaging by endoscopy may be needed
I hope this helps , feel free to ask any other questions