Metronidazole tablets are usually used to treat a variety of anaerobic bacterial infections, if a longer period of continuous consumption of metronidazole up to several boxes may lead to gastrointestinal reactions, neurological reactions and other adverse reactions. 1. Gastrointestinal reaction: metronidazole tablets eaten for too long may appear anorexia, nausea, vomiting, abdominal pain, diarrhea and other adverse reactions, and may even have a dry mouth and oral metallic taste and other adverse reactions. 2. Neurological reactions: metronidazole tablets eaten for too long may lead to dizziness, vertigo and ataxia and other neurological adverse reactions, and may even lead to seizures, numbness of the extremities and sensory abnormalities. The diagnostic impact of metronidazole should be noted as it may cause the urine to turn a dark red color. Metronidazole tablets should be contraindicated in patients with active cardiovascular diseases as well as blood disorders. If you need to use the drug, it is recommended to use it under the supervision of a doctor. If there is any discomfort after the use of the drug, it is necessary to consult a doctor and make appropriate treatment under the guidance of a doctor.