I was diagnosed with gastritis so was given vanproz RD . but after taking vanproz RD my stool started to become black(sometimes powdry , but  mostly semi solid pieces ) . I don't have any pain now , infact my symptoms reduced after taking the medication. This medicine were gives after a gastro check up by doctor which involved abdominal scan , endoscope , blood test , urine test , ECG and X-ray .