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oxibendazole

n. A benzimidazole anthelminthic drug used in horses and some domestic pets.

Wikipedia
Oxibendazole

Oxibendazole is a benzimidazole drug that is used to protect against roundworms, strongyles, threadworms, pinworms and lungworm infestations in horses and some domestic pets. It is usually white to yellowish in appearance, and may take the form of a powder or a tablet.