Possible side effects from metronidazole include:

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

Tell your doctor if any of these symptoms are severe or do not go away:

nausea, vomiting, or loss of appetite
an unpleasant metallic taste in your mouth
constipation or mild diarrhea
headache
swollen or sore tongue

If you experience any of the following symptoms, call your doctor immediately:

an allergic reaction (swelling of your lips, tongue, or face; shortness of breath; closing of your throat; or hives)
seizures
numbness or tingling
dizziness or loss of coordination
severe diarrhea


Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.

 

FDA Information

Why is this medication prescribed?

Other uses for this medicine

Dosage and using this medicine

What special precautions should I follow?

What should I do if I forget a dose?

What storage conditions are needed for this medicine?

In case of an emergency/overdose