Minor side effects include
nausea, headaches, loss of appetite, a metallic taste,
and rarely a rash. Serious side effects of metronidazole are rare. Serious side effects include seizures and damage of nerves resulting in numbness and tingling of extremities . If the tingling in your hands persists, you must inform your doctor about this. Metronidazole should be discontinued. Take care and do keep us posted.