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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Loose Stool After An Antibiotic Course?

My Brother, 5 months ago he was bitten by a spider he thinks, or a Doctor said. He was given a high dose of Antibiotics and the spider bite got better. I found out today, he has very loose stools actually he just water comes out. Once or twice in the morning. This has been going on for 5 months. He says he has spoken to Doctors and is making appointments. His blood tests are fine, and he is going to have a upper and lower GI. Is there something else going on, because he never would tell me this.
posted on Thu, 27 Nov 2014
Twitter Thu, 29 Jan 2015 Answered on
Twitter Fri, 30 Jan 2015 Last reviewed on
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Pain Medicine & Palliative Care Specialist,  's  Response
Hi there,
Thanks for using HCM.
Loose stools after a course of antibiotics can be due to Clostridum difficile infection.
A stool test may be done for confirmation.
Colonsocopy may show pseudomembranes in the colon.
A 10 day course of metronidazole would provide relief.
Other options include vancomycin, fidoxomicin and probiotics.

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What Causes Loose Stool After An Antibiotic Course?

Hi there, Thanks for using HCM. Loose stools after a course of antibiotics can be due to Clostridum difficile infection. A stool test may be done for confirmation. Colonsocopy may show pseudomembranes in the colon. A 10 day course of metronidazole would provide relief. Other options include vancomycin, fidoxomicin and probiotics. Is this answer helpful?