Flagyl 7 Things You Should Know
May 24, 2021 A headache, nausea, diarrhea, flushing, an unpleasant metallic taste, peripheral neuropathy nerve damage to fingers and toes, or a rash are common side effects. Rarely, seizures may occur. Elderly people may be more sensitive to the side effects of Flagyl. Cases of encephalopathy and peripheral neuropathy have been reported with metronidazole.