Dosing recommendations for antiparasitics depend on national regulations. National regulatory authorities determine whether a product is approved for a given indication, i.e. use on a particular host at a specific dose and against a specific parasite. Check the labels of the products available in your country for specific information on approved indications.

The table below indicates some usual dosing recommendations for fenbendazole issued by manufacturers or documented in the scientific literature. They may not be approved in some countries.

Fenbendazole is a broad-spectrum anthelmintic effective against roundworms and, depending on the dose also against some tapeworms (e.g. Moniezia spp) as well. It is ineffective against flukes (e.g. Fasciola hepatica adults) at the usual therapeutic dose. It is completely ineffective against external parasites. Oral administration is the rule. It is used massively in all kinds of livestock (mainly in drenches and feed additives), and abundantly in pets (often in tablets, pills, etc. or oral suspensions) and horses (mostly in oral pastes & gels). There are hundreds of generic brands worldwide, also in mixtures with other anthelmintics.

In ruminants, a 50% reduction of the diet 36 prior and 8 hours after treatment slows down the passage through the stomach, which increases the bioavailability of benzimidazoles and their metabolites and consequently its efficacy against gastrointestinal parasites.

In carnivores (incl. dogs and cats) delivery with the food increases the bioavailability of all benzimidazoles resulting in a better efficacy.

All benzimidazoles have almost no residual effect, i.e. they kill the parasites during a few hours after treatment but offer no significant protection against re-infestation.

Dosing recommendations for FENBENDAZOLE
DOGS
Delivery Parasites Dose (against fenbendazole-susceptible parasites)
Oral Gastrointestianl roundworms 50 mg/kg/day x3 days
Oral Ascarids (Toxocara, Toxascaris)
50 mg/kg/day x3 days
Oral Ascarids: Prevention of prenatal or lactogenic transmission
5 mg/kg/day from day 40 of pregnancy till 2 days after birth
Oral Angiostrongylus vasorum 20-50 mg/kg/day, x5 days
Oral Capillaria aerophila 50 mg/kg 2x/day, x10-14 days
Oral Capillaria plica 50 mg/kg/day x3 days, rep 1x50 mg/kg after 3 weeks
Oral Crenosoma vulpis 50 mg/kg/day x3 days
Oral Filaroides hirthi 50 mg/kg/day x14 days
Oral Filaroides osleri 50 mg/kg/day x10 days
Oral Paragonimus kellicotti 20-50 mg/kg/day x5 days
Oral Taenia spp 50 mg/kg/day x3 days
Oral Trichinella spiralis (in muscle) 25 mg/kg 2x/day x5 days
Oral  Trichuris vulpis 50 mg/kg/day x3 days, rep after 2-3 weeks & after 2 months
CATS
Delivery Parasites Dose (against fenbendazole-susceptible parasites)
Oral Gastrointestianl roundworms 50 mg/kg/day x3-5 days
Oral Aelurostrongylus abstrusus 50 mg/kg/day x3-4 days
Oral Capillaria aerophila 50 mg/kg/day, x10 days
Oral Capillaria feliscati 35 mg/kg 2x/day x3-10 days
Oral Paragonimus kellicotti  50 mg/kg/day x10-14 days 
CATTLE
Delivery Parasites Dose (against fenbendazole-susceptible parasites)
Oral Roundworms 5-7.5 mg/kg
Oral Roundworms 1 mg/kg/day x5-10 days, mixed with feed
Oral Dictyocaulus viviparus 5-7.5 mg/kg, rep after 4 weeks if needed
Oral Fasciola hepatica, adults 15 mg/kg/day x6 days
Oral Moniezia spp 10 mg/kg
Oral Ostertagia ostertagi inhibited larvae 10 mg/kg
Oral Giardia spp 10 mg/kg 2x/day x 3 days
SHEEP  
Delivery Parasites  Dose (against fenbendazole-susceptible parasites)
Oral Roundworms  5-10 mg/kg
Oral Dicrocoelium dendriticum 100-150 mg/kg; or 25 mg/kg/day x5 days
Oral Fasciola hepatica, adults 150 mg/kg; or 10-30 mg/kg/day x5 days
Oral Moniezia spp 5-15 mg/kg
Oral Muellerius capillaris 20-40 mg/kg; or 5 mg/kg x6-14 days
GOATS
Delivery Parasites  Dose (against fenbendazole-susceptible parasites)
Oral Roundworms  5 mg/kg
Oral Roundworms  5 mg/kg x5 days, mixed with feed
Oral Dicrocoelium dendriticum 100 mg/kg; or 25 mg/kg x5 days; or 10 mg/kg x10 days
Oral  Fasciola hepatica, adults 150 mg/kg; or 30 mg/kg/day x5 days
Oral  Moniezia spp 5-15 mg/kg
Oral  Muellerius capillaris 15 mg/kg x2 days, rep after 35 days
SWINE 
Delivery Parasites  Dose (against fenbendazole-susceptible parasites)
Oral Roundworms 3-6 mg/kg
Oral Roundworms 20 ppm in feed x5 days; sows 100 ppm
Oral Roundworms 10 ppm in feed x10 days; sows 50 ppm
Oral Ascaris suum 10 mg/kg
Oral Ascarids (migrating larvae) 3 mg/kg/day x3 days
Oral Metastrongylus spp 25 mg/kg
Oral Stephanurus dentatus 3 mg/kg/day x3 days
Oral Strongyloides spp
5 mg/kg/day x3 days
Oral Trichuris suis 25 mg/kg
HORSES
Delivery Parasites  Dose (against fenbendazole-susceptible parasites)
Oral Roundworms 5-7.5 mg/kg
Oral Ascarids 10 mg/kg
Oral Ascarids (migrating larvae) 10 mg/kg/day x5 days
Oral Dictyocaulus arnfieldi 7.5-10 mg/kg
Oral Habronema spp 10 mg/kg/day x5 days
Oral Oxyuris equi (immatures in the gut) 10 mg/kg
Oral Cyathostomins (mucosal larvae) 7.5 mg/kg/day x5 days
Oral Strongyloides westeri 50 mg/kg
Oral Strongylus spp (migrating larvae)
10 mg/kg/day x5 days; or 50 mg/kg/day x3 days; o 60 mg/kg 1x
Oral Thelazia lacrimalis 10 mg/kg/day x5 days
Oral Trichostrongylus spp 50 mg/kg
SOUTH AMERICAN CAMELIDS
Delivery Parasites  Dose (against fenbendazole-susceptible parasites)
Oral Roundworms 5-15 mg/kg
Oral Moniezia spp 10 mg/kg x3 days
POULTRY
Delivery Parasites Dose (against fenbendazole-susceptible parasites)
Oral Ascarids 10-50 mg/kg, rep after 10 days
Oral Ascarids (Chicken) 15-25 mg/kg/day x3 days
Oral Ascarids (Pheasants, partridges) 120 ppm in feed x3 days; or 60 ppm in feed x6 days
Oral Capillaria spp 10-50 mg/kg x5 days
Oral Heterakis spp (Pheasants, partridges) 60 ppm in feed x6 days
Oral Syngamus trachea (Pheasants, partridges) 120 ppm in feed x3 days; or 60 ppm in feed x6 days

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