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Pharmacological particulars
ATCvet code QP52AC13
Pharmacotherapeutic group
Anthelmintics, benzimidazoles and related substances
Pharmacodynamic properties
Fenbendazole is an anthelmintic belonging to the benzimidazole carbamates group. It acts by interfering in the energy metabolism of the nematode. The anthelmintic efficacy is based on inhibition of the polymerisation of tubulin to microtubuli. The anthelmintic affects both adult and immature stages of gastro-intestinal and respiratory nematodes.
Fenbendazole is metabolised to its sulphoxide, then to sulphone and amines.
Pharmacokinetic particulars
Fenbendazole is only partly absorbed after oral administration and is then metabolised in the liver. Fenbendazole and its metabolites are distributed throughout the body and high concentrations can be found in the liver. The elimination of fenbendazole and its metabolites occurs primarily via the faeces (>90%) and to a smaller extent in the urine and milk.