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What Causes Dark Stool While On Antibiotics?

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Posted on Wed, 22 Mar 2017
Question: i am on curam duo forte and have a one off dark stool. Is that a side effect of this antibiotics
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Answered by Dr. Michelle Gibson James (53 minutes later)
Brief Answer:
not a known side effect

Detailed Answer:
HI, thanks for using healthcare magic

Curam duo forte contains amoxicillin and clavulinic acid. It is a commonly used antibiotic.

Dark discoloration of the stool is not a known side effect of this medication. This effect can occur with iron tablets and pepto bismol.

It can also occur if there is bleeding in the upper part of the GI tract (the esophagus, stomach, small intestines), by the time the blood reaches the anus, it causes a black appearance.
This would be more common in persons with a history of reflux or an ulcer of the stomach.

If you continue to have dark stool and you are not using iron tablets or pepto bismol then you should consider seeing your doctor for an assessment.

I hope this helps, feel free to ask any other questions
Note: For further follow up on digestive issues share your reports here and Click here.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Michelle Gibson James

General & Family Physician

Practicing since :2001

Answered : 16808 Questions

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What Causes Dark Stool While On Antibiotics?

Brief Answer: not a known side effect Detailed Answer: HI, thanks for using healthcare magic Curam duo forte contains amoxicillin and clavulinic acid. It is a commonly used antibiotic. Dark discoloration of the stool is not a known side effect of this medication. This effect can occur with iron tablets and pepto bismol. It can also occur if there is bleeding in the upper part of the GI tract (the esophagus, stomach, small intestines), by the time the blood reaches the anus, it causes a black appearance. This would be more common in persons with a history of reflux or an ulcer of the stomach. If you continue to have dark stool and you are not using iron tablets or pepto bismol then you should consider seeing your doctor for an assessment. I hope this helps, feel free to ask any other questions