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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Is It Normal To Have Black Stool After An IV Infusion?

Had an IV infusion for the first time 2 days ago. Stools are very black. Is this normal? I thought it would only happen with oral iron. the infusion is called Ferinject: ferric carboxymaltose had 1000mg administered. the infusion was given after a colonoscopy which was clear.
Sat, 30 Sep 2017
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General Surgeon,  's  Response
Hi.
Thanks for your query.
Noted the history and understood your concerns.
Although colonoscopy was clear the black stool called as malena is usually due to bleeding from mouth to the mid part of colon that gets converted to black color.
Hence you should go for urgent upper GI Endoscopy, ENT examination and tests of blood and stool to confirm whether this is blood in gastrointestinal tract or not.
Intravenous Ferric Carboxymaltose should not cause malena as this is not a oral preparation.
Stop meat and any other foods and beverages that contain more iron to have daily test of stool for occult blood.
Once diagnosed, get treated accordingly.
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Is It Normal To Have Black Stool After An IV Infusion?

Hi. Thanks for your query. Noted the history and understood your concerns. Although colonoscopy was clear the black stool called as malena is usually due to bleeding from mouth to the mid part of colon that gets converted to black color. Hence you should go for urgent upper GI Endoscopy, ENT examination and tests of blood and stool to confirm whether this is blood in gastrointestinal tract or not. Intravenous Ferric Carboxymaltose should not cause malena as this is not a oral preparation. Stop meat and any other foods and beverages that contain more iron to have daily test of stool for occult blood. Once diagnosed, get treated accordingly.