Thank you for the query.
If your stool is black like a tar and has strange smell (not like regular stool, more like digested iron) this can indicate bleeding from peptic ulcer
. Macrobid is mild antibiotic which like every medicine can irritate digestive tract. However bleeding from peptic ulcers seems to be unrelated.
Upper right abdominal pain
can be also caused by gallstones, however usually it radiates to the back, gives nausea and vomiting
. It appears after a meal.
I suggest you to visit your doctor as soon as possible. Bleeding should be ruled out (blood work and upper GI endoscopy
should be done). Abdominal ultrasound
should be performed in case of gallstones possibility.
Hope this will help.