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Side Effects of Flagyl (Metronidazole)

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Updated August 19, 2012

Common Side Effects:

Check with your doctor if any of the following side effects continue or are bothersome:

  • Diarrhea
  • dizziness or lightheadedness
  • headache
  • loss of appetite
  • nausea or vomiting
  • stomach pain or cramps

Less frequent or rare:

Check with your doctor if any of the following side effects continue or are bothersome:

  • change in taste sensation
  • dryness of mouth
  • unpleasant or sharp metallic taste

Check With Your Doctor:

Less common

  • any vaginal irritation, discharge, or dryness not present before use of this medicine
  • clumsiness or unsteadiness
  • mood or other mental changes
  • skin rash, hives, redness, or itching
  • sore throat and fever
  • stomach and back pain (severe)

For injection form

  • Pain, tenderness, redness, or swelling over vein in which the medicine is given

Notify Doctor Immediately:

Less common

  • numbness, tingling, pain, or weakness in hands or feet

Rare

  • convulsions (seizures)

Other Notes:

Metronidazole (flagyl) may cause dark urine in some patients. This is temporary and will go away when you stop taking this medicine.

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor. This information is meant only as a guideline - always consult a physician or pharmacist for complete information about prescription medications.

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  3. Inflammatory Bowel Disease (IBD)
  4. Treatments For IBD
  5. IBD - Drugs
  6. Flagyl
  7. Side Effects of Flagyl (Metronidazole)

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