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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Black Stool While On Medication?

What could cause black stool. I have recently been prescribed tow new medicines: 1. Blood thinner (Warfarin) 2. Toprol. About a week after taking these two medications, I have noticed black stool. I regularly have my blood tested for INR. My INR is currently between 2.3 and 2.5.
posted on Sat, 28 Mar 2015
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