Crohn's Disease Forum » Treatment » Metronidazole(Flagyl) questions

09-18-2017, 12:46 PM   #1
Join Date: Jul 2011
Location: Aberdeen, United Kingdom
Metronidazole(Flagyl) questions

So I've been prescribed a 7-day course of Metronidazole(Flagyl) for a fistula. Haven't started yet. A few questions:
  • It seems like quite a few people get diarrhoea and frequent movements while on it. I'm a bit apprehensive about that when my BM's have been really good and solid for ages. How quickly do you folks usually experience side effects (and what side effects)?
  • Does it clear up when you're done with the course? Although I'm only on it for 7 days, which probably isn't too long. By the looks of it, some people are on it for months at a time.
  • I just read that there's such a thing as Metronidazole suppositories. Has anyone used those before? It sounds like (at a guess) that that might have been more appropriate than the oral form I'm to take.

09-18-2017, 03:11 PM   #2
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ronroush7's Avatar
Join Date: Oct 2013
Location: vienna, Virginia

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I had side effects from flsgyl and they disappeared soon after I stopped the medication. I experienced numbness in my hands.
Diagnosed in 1990. On Humira, Imuran, Gabapentin, Colestipol, Synthroid, Lialda. Resection in April of 2010. Allergic to Remicade, Penicillin, Flagyl, Doxycycline. Thyroid issues and psoriasis and neuropathy and mild cerebral palsy. Mild arthritis in my lower back.
09-18-2017, 07:46 PM   #3
Lucky One
Join Date: Apr 2016
Location: Burlngton, Ontario
I developed pancreatitus when on Flagyl so had to stop as well.
09-18-2017, 07:49 PM   #4
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Join Date: Aug 2014
Location: British Columbia

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Hi artheta,

I was on that medicine off and on for years. The worst trouble I had was a taste of tinfoil in my mouth, although it did cause the runs at times. I believe I wasn't allowed to drink any alcohol either. If it were me I would take it as directed and report any serious side effects. I would also look into a good probiotic, such as VSL#3 when you are finished your course of antibiotics. I have heard of people that take the probiotics during the course of flagyl, but the pharmacist said that you must take the probiotic 2-3 hours after the flagyl or it does not survive the antibiotics well.

Here is a link to more info...,flagyl.html

Best regards,


Last edited by cmack; 09-18-2017 at 07:55 PM. Reason: Adding link
09-19-2017, 12:39 AM   #5
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DustyKat's Avatar
Join Date: May 2010
Location: New South Wales, Australia
My son was on Flagyl for 6 months. Three months pre op at full dose, three months post op at half dose.

He had no side effects but did find the brand significantly more palatable than the generic. The brand had a smooth coating whereas the generic had a powdery coating.
Mum of 2 kids with Crohn's.
09-19-2017, 01:27 PM   #6
Join Date: Jul 2011
Location: Aberdeen, United Kingdom
Thanks for the answers folks... here goes!

Crohn's Disease Forum » Treatment » Metronidazole(Flagyl) questions
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