parbendazole

parbendazole

a broad-spectrum benzimidazole anthelmintic used with good effects against the common parasites of cattle, pigs and horses. It acts quickly reaching peak blood levels 6 to 8 hours after administration. Its use in pregnant animals is contraindicated because of its teratogenicity; the defects are largely skeletal. Like other benzimidazoles it suffers from the problem of resistance developing in the resident worm population if it is used persistently.