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J Med Microbiol. 1992 Sep;37(3):221-4.

In-vitro susceptibility of Giardia lamblia to albendazole, mebendazole and other chemotherapeutic agents.

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  • 1Unidad de Investigación Clinica en Enfermedades Infecciosas y Parasitarias, Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, D.F.


The susceptibility of a strain of Giardia lamblia to benzimidazole carbamates, 5-nitroimidazoles, nitrofurans and other drugs was studied in vitro. Albendazole was the most active compound, with a 50% inhibitory concentration (IC50) of 0.01 mg/L and a minimal lethal concentration (MLC) of less than 0.04 mg/L; the IC50 of mebendazole was 0.06 mg/L and the MLC less than 0.5 mg/L. Among the 5-nitroimidazoles tested, ornidazole was the most effective (IC50 0.12 mg/L); tinidazole, metronidazole, secnidazole and hemezole were less active. Nifuroxazide, etofamide and nalidixic acid exhibited modest anti-giardial activity; quinfamide did not inhibit the growth of the parasite at a concentration of 200 mg/L. Albendazole and mebendazole are promising candidates for clinical use and should be further evaluated.

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