A member asked:

Hi i was constipated and drank magnesium citrate two nights ago. by today my stool is black, runny, and oily/greasy looking. what should i do.

A doctor has provided 1 answer
Dr. Mark Pack answered

Specializes in General Surgery

Truly black???: Black stool indicates possible bleeding ulcer or blood loss somewhere in the proximal GI tract. You need to see your doctor as soon as possible to check it out.

Answered 4/28/2016

3.6k views

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