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Review: could Coumadin cause Blood in stool?

Summary: Blood in stool could be caused by Coumadin, especially for people who are male, 60+ old, have been taking the drug for < 1 month, also take Aspirin, and have Hypercholesterolaemia.

We study 72,161 people who have side effects while taking Coumadin from FDA and social media. Among them, 187 have Blood in stool. Find out below who they are, when they have Blood in stool and more.

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Coumadin (latest outcomes from 75,036 users) has active ingredients of warfarin sodium. It is often used in blood clots, deep venous thrombosis. Commonly reported side effects of Coumadin include international normalised ratio increased, dyspnoea exacerbated, breathing difficulty, weakness, nausea.

Blood in stool

Blood in stool (latest reports from 11,432 patients) has been reported by people with irritable bowel syndrome, ill-defined disorder, depression, weight loss, high blood cholesterol.

On Apr, 16, 2014: 72,161 people reported to have side effects when taking Coumadin. Among them, 187 people (0.26%) have Blood In Stool. They amount to 1.64% of all the 11,432 people who have Blood In Stool on eHealthMe.

Trend of Blood in stool in Coumadin reports

Time on Coumadin when people have Blood in stool * :

< 1 month1 - 6 months6 - 12 months1 - 2 years2 - 5 years5 - 10 years10+ years
Blood in stool70.00%10.00%0.00%0.00%10.00%0.00%10.00%

Age of people who have Blood in stool when taking Coumadin * :

Blood in stool0.00%0.00%0.00%0.56%4.47%4.47%8.38%82.12%

Severity of Blood in stool when taking Coumadin ** :


How people recovered from Blood in stool ** :


Top conditions involved for these people * :

  1. Hypercholesterolaemia (5 people, 2.67%)
  2. Prophylaxis (3 people, 1.60%)
  3. Obesity (2 people, 1.07%)
  4. Vitamin supplementation (2 people, 1.07%)
  5. Atrial fibrillation (2 people, 1.07%)

Top co-used drugs for these people * :

  1. Aspirin (46 people, 24.60%)
  2. Lasix (39 people, 20.86%)
  3. Vioxx (34 people, 18.18%)
  4. Lanoxin (29 people, 15.51%)
  5. Digoxin (23 people, 12.30%)

* Approximation only. Some reports may have incomplete information.

** Reports from social media are used.

How to use the study: print a copy of the study and bring it to your health teams to ensure drug risks and benefits are fully discussed and understood.

Related topic: Coumadin, Blood in stool

You can also:

On eHealthMe, Coumadin (warfarin sodium) is often used for blood clots. Find out below the conditions Coumadin is used for, how effective it is, and any alternative drugs that you can use to treat those same conditions.

What is Coumadin used for and how effective is it:

Other drugs that are used to treat the same conditions:

Drugs in real world that are associated with:

Could your condition cause it?

Comments from related studies:

  • From this study (8 months ago):

  • I have been taking warfrin for 6 months. My INR has stayed really low, so they have continued to raise the dosage. My INR then spiked at over 6. He dropped me down just a little and it dropped to BELOW 1! He is trying to figure out why my body will not "metabolize" (his words ... not mine) and I am getting frustrated. I have read all the information on how to manage the med... but it just isn't working. He said something about the prostate having something to do with this. Does that sound familiar?


NOTE: The study is based on active ingredients and brand name. Other drugs that have the same active ingredients (e.g. generic drugs) are NOT considered.

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only, and has not been supported by scientific studies or clinical trials unless otherwise stated. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

You may report adverse side effects to the FDA at or 1-800-FDA-1088 (1-800-332-1088).

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.

Related study

- Coumadin side effects


Related symptom

- Blood In Stool



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