患者男性,27岁,农民。7天前一次误服乙胺嘧啶约400片(剂量约为2.500毫克),2小时后口唇发绀,口吐白沫,抽搐,被送至当地医院,经洗胃,补液、止痉等处理,神志清醒后回家。但此后患者感头昏,心里难受,恶心呕吐, Male patient, 27 years old, farmer. 7 days ago, about 400 tablets of pyrimethamine (dosage was about 2.500 mg) were inadvertently taken. After 2 hours, the lips were cyanotic, foaming at the mouth and twitching. They were taken to the local hospital for gastric lavage, rehydration and antispasmodic treatment. Go home after conscious. However, after the patient feeling dizzy, uncomfortable, nausea and vomiting,