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This class of drugs are known by farmers as white drenches. The product code in the UK is '''1-BZ'''. The most commonly used drugs in this category are; '''albendazole, fenbendazole''' and '''oxfendazole'''.
==Spectrum of Activity==
* Wide spectrum, they are active against '''adult and immature [[nematodes]]''', though have limited action against hypobiotic forms.
* Some have activity against the [[cestodes]].
* Albendazole has activity against adult [[trematodes|liver flukes]].
* Albendazole and fenbendazole are active against [[protozoa|Giardia]].
* '''Triclabendazole''' is active against all stages of ''Fasciola hepatica'', but inactive against nematodes and cestodes.
* They