患者女,31岁。于2003年8月8日因牙痛自服甲硝唑片0.4g,tid。服药至第4天晨,发现躯干部出现约3～4片荨麻疹,可自行消退,反复发作2～3次,未治疗。当晚,又口服甲硝唑片0.4g,4h后出现上口唇肿胀、麻木,即来我院就诊。服药以来无恶心、呕吐,无腹痛、腹泻。一年前曾因同样症状口服甲? Female patient, 31 years old. On August 8, 2003 due to toothache since the service metronidazole tablets 0.4g, tid. Taking medicine to the morning of the fourth day, about 3 to 4 urticaria were found in the trunk, which subsided on their own and repeated 2 or 3 times without treatment. That night, and oral metronidazole tablets 0.4g, 4h after lip swelling, numbness, that is to our hospital. Since taking medicine no nausea, vomiting, no abdominal pain, diarrhea. A year ago for the same symptoms orally?