Side effects   Return to top

Metronidazole may cause side effects. Tell your health care provider if any of these symptoms are severe or do not go away:

• vomiting
• upset stomach
• diarrhea
• loss of appetite
• dry mouth or sharp, unpleasant metallic taste
• dark or reddish-brown urine
• furry tongue or mouth or tongue irritation
• numbness or tingling of the hands or feet

If you experience any of the following symptoms, call your health care provider immediately:

• rash
• itching
• stuffy nose
• fever
• joint pain

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online at http://www.fda.gov/MedWatch/report.htm or by phone 1-800-332-1088.