What Causes Blood In Stool After Taking Cephalexin And Metronidazole?

Posted on Thu, 29 Jan 2015

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Thu, 29 Jan 2015 Answered on

Thu, 26 Feb 2015 Last reviewed on

Question : I took antibiotic cephalexin 500 mg, metronidazole 250 mg, and Ibuprofen for 10 days. During 8th day, i had blood in stool. I asked my Dentist (who prescribed) and he told me to stop metronidazole. Today is 11th day, ny stool is black. Is it a concern or will it be okay since i stopped antibiotics. I am 49 years old female.

Answered by Dr. Dr Samir Patil (21 minutes later)

Brief Answer:
You need to start on Omeprazole once a day.

Detailed Answer:
Hello,

Ibuprofen is likely to cause GI bleeding.

I would advise you to get hemoglobin levels checked to see if the levels are low.
I would advise to start omeprazole once a day for at least 4 weeks.

In case the hemoglobin is low or the black stools continue you would need an upper GI endoscopy.

Hope this helps

Regards
Dr Samir Patil

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Above answer was peer-reviewed by : Dr. Ashwin Bhandari