 Infections with soil-transmitted helminthes STH occur throughout the developing world and remain a major public health problem in the poorest communities. Preventive chemotherapy PC programs in which single-dose albendazole 400 mg or single-dose mebendazole 500 mg - the drugs of choice for STH - are administered at the population level, is the main strategy for STH control. To ensure quality, these drugs are being widely donated by GlaxoSmithKline GSK albendazole ALB, Zentel and Johnson Johnson mebendazole MEB, Vermox. In addition to this, there are a wide variety of ALB and MEB tablets available on the local market. Although little is known about the quality of anthelmintics sold for human use, several publications have reported variability in the quality of generic anthelmintics used in veterinary medicine. The main objective of the present study is to compare the efficacy of two ALB brands bought on the local market, including OVIS Korea, DAEHWA pharmaceutical and BENDEX India, Cipla 