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What Causes Dark Green Discolouration In Stool While On Azithromycin And NyQuil?

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Posted on Thu, 7 Jan 2016
Question: Stool is a dark bright green for two days. Was taking Azithromycin for bronchitis and still taking NyQuil. Can NyQuil be the cause? It is the same color as the NyQuil.
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Answered by Dr. Bonnie Berger-Durnbaugh (32 minutes later)
Brief Answer:
Most likely due to food coloring.

Detailed Answer:
Hello and welcome,

Well that can certainly be disturbing to have green poop! But I think you are on the right track to be suspicious of the NyQuil.

Medical causes for green stool are biliary/gall bladder problems, and rapid transit time through the intestines.

But the most common causes are food coloring, green leafy foods (kale, etc) and oral iron supplements.

The green color should resolve within 3-4 days of your last dose of NyQuil.

If you are having persistent abdominal pain or diarrhea, then do follow up with your doctor. Otherwise you can chalk it up to the NyQuil.

I hope this helps.


Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Follow up: Dr. Bonnie Berger-Durnbaugh (41 minutes later)
Thank you!
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Answered by Dr. Bonnie Berger-Durnbaugh (8 minutes later)
Brief Answer:
Your welcome.

Detailed Answer:
I hope you you feel better from your bronchitis soon.

If you have no further questions, you can go ahead and close the discussion.

For future questions if you want to have me answer, you can get me by putting my name at the beginning of your question. Then the moderator will tag it for me to answer.

Best regards,
Bonnie Berger-Durnbaugh, MD
Note: For more detailed guidance, please consult an Internal Medicine Specialist, with your latest reports. Click here..

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Bonnie Berger-Durnbaugh

General & Family Physician

Practicing since :1991

Answered : 3133 Questions

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What Causes Dark Green Discolouration In Stool While On Azithromycin And NyQuil?

Brief Answer: Most likely due to food coloring. Detailed Answer: Hello and welcome, Well that can certainly be disturbing to have green poop! But I think you are on the right track to be suspicious of the NyQuil. Medical causes for green stool are biliary/gall bladder problems, and rapid transit time through the intestines. But the most common causes are food coloring, green leafy foods (kale, etc) and oral iron supplements. The green color should resolve within 3-4 days of your last dose of NyQuil. If you are having persistent abdominal pain or diarrhea, then do follow up with your doctor. Otherwise you can chalk it up to the NyQuil. I hope this helps.