Various benzimidazole compounds have been shown to be highly eIIective as inhibitors (up to 50% reduction of activity) in vitro of the helminth-specilic enzyme, fumarate reductase, of Ascaris suum. Anthelmintically active and inactive benzimidazoles were similarly effective as inhibitors of enzyme activity. Albendazole-induced inhibition of Iumarate reductase was not observed when the enzyme was preincubated with NADH.

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