兰氏贾第鞭毛虫是人体潜在的病原,感染后,轻者可不出现症状,重者可完全丧失劳力。治疗失败的原因可能是产生了抗药株,因此有必要寻求更加有效、无毒、廉价的药物。甲苯咪唑系广谱驱虫药,鉴于该药对人毛滴虫、热带利什曼原虫和埃及血吸虫有效,故作者研究并首次报告了该药对贾第鞭毛虫感染的疗效。作者选门诊病人40例作为研究对象,其中男性18例,女性22例。年龄为2～32岁,平均为10.2岁,其中12岁以下26例。全部病人 Giardia lamblia is a potential pathogen of the human body, after infection, the light can not appear symptoms, severe cases can be completely lost labor. Treatment failure may be due to the emergence of drug-resistant strains, it is necessary to find more effective, non-toxic, cheap drugs. Mebendazole is a broad-spectrum deworming drug that, given its efficacy against human trichomonads, Leishmania tropicalis and schistosomiasis, the authors studied and reported for the first time the efficacy of the drug against Giardian infections. The author selected outpatients 40 cases as the research object, including 18 males and 22 females. Aged 2 to 32 years old, with an average of 10.2 years old, of which 26 cases under the age of 12. All patients