Description:
Oxfendazole (CAS No.: 53716-50-0) is a broad-spectrum benzimidazole anthelmintic exclusively used in veterinary medicine, renowned for its high efficacy, low toxicity and good oral bioavailability. As the active metabolite of fenbendazole, it has enhanced tissue penetration and absorption compared to its parent compound, making it a first-line anthelmintic for the prevention and treatment of helminth (worm) infections in livestock, companion animals and a small number of poultry species. Its core mechanism of action is selectively inhibiting the synthesis of β-tubulin—a key structural component of microtubules in helminth somatic and reproductive cells. This inhibition disrupts microtubule assembly, impairs the helminth’s nutrient absorption (via intestinal microvilli), cellular division and muscular motility, ultimately leading to worm starvation, paralysis and death. Oxfendazole is effective against the adult, larval (L3/L4) and egg stages of most common helminths, with no cross-resistance to non-benzimidazole anthelmintics, and it exerts minimal adverse effects on the host’s normal cells (no β-tubulin inhibition in mammals at therapeutic doses).
Oxfendazole is the most widely used benzimidazole anthelmintic in global animal husbandry, with its primary applications centered on the systemic deworming of food-producing livestock (cattle, sheep, goats, pigs, horses) and the treatment of helminth infections in companion animals (dogs, cats). It targets nearly all major gastrointestinal and respiratory helminths, as well as some cestodes (tapeworms) and trematodes (flukes), and is widely used for both therapeutic deworming (treating active infections) and prophylactic deworming (preventing infection in high-risk herds/flocks). Below is a systematic breakdown of its detailed veterinary uses, applicable species and target helminths, in line with international veterinary pharmacopoeia and animal husbandry guidelines:
1. Primary Veterinary Uses: Deworming of Food-Producing Livestock (Core Indication)
Oxfendazole is the gold standard anthelmintic for ruminants (cattle, sheep, goats) and swine, and a key dewormer for equines, due to its broad spectrum, high efficacy and convenient administration (oral powder, paste, premix for feed addition). It is indicated for the treatment and control of gastrointestinal nematodiasis, pulmonary nematodiasis and cestodiasis—the most prevalent and economically damaging helminth infections in livestock production, which cause weight loss, reduced feed conversion efficiency, reproductive disorders and even death in severe cases.
1.1 Ruminants (Cattle, Sheep, Goats)
Ruminants are the primary application population for oxfendazole, and it is the first-choice dewormer for both beef/dairy cattle and meat/wool sheep/goats (including young stock, adults and breeding animals).
Target helminths: It is highly effective against all major gastrointestinal nematodes (GINs) of ruminants, including Haemonchus contortus (barber’s pole worm), Ostertagia ostertagi (brown stomach worm), Trichostrongylus spp. (hair worm), Cooperia spp., Nematodirus spp., Strongyloides papillosus and Oesophagostomum spp. (nodular worm); it also eliminates pulmonary nematodes such as Dictyocaulus viviparus (cattle lungworm) and Dictyocaulus filaria (sheep lungworm). For cestodes, it is the first-line treatment for Moniezia expansa and Moniezia benedeni (Moniezia tapeworms), the most common tapeworms in young ruminants.
Clinical value: It effectively reduces worm burden in the gastrointestinal tract and lungs, alleviates clinical symptoms (diarrhea, emaciation, cough, dyspnea, anemia), improves feed conversion rate and daily weight gain, and prevents reduced milk production in dairy cattle and wool quality in sheep. It is widely used for mass deworming of ruminant herds/flocks (2–4 times a year) and targeted deworming of sick animals.
1.2 Swine (Pigs)
Oxfendazole is the preferred oral anthelmintic for swine of all ages (suckling piglets, weaners, growers, sows and boars), with excellent efficacy against swine-specific helminths and no adverse effects on swine growth and reproduction at therapeutic doses.
Target helminths: It eradicates gastrointestinal nematodes including Ascaris suum (swine roundworm), Trichuris suis (whipworm), Oesophagostomum dentatum (nodular worm), Strongyloides ransomi (threadworm) and Hyostrongylus rubidus (red stomach worm); it also has significant efficacy against Taenia solium (pork tapeworm) and Metastrongylus apri (swine lungworm), which are common in free-range and intensive pig farms.
Clinical value: Swine helminth infections often cause stunted growth, poor feed efficiency and intestinal damage; oxfendazole rapidly clears worm infestations, promotes healthy growth of piglets and weaners, and prevents reproductive failure (e.g., abortion, stillbirth) in breeding sows caused by severe roundworm infection. It is commonly added to swine feed as a premix for routine prophylactic deworming.
1.3 Equines (Horses, Ponies, Donkeys)
Oxfendazole is a safe and effective dewormer for equines of all ages (foals, adults, breeding horses), indicated for the treatment of intestinal helminth infections—the most common parasitic diseases in equine husbandry and equestrian management.
Target helminths: It is highly effective against equine gastrointestinal nematodes such as Parascaris equorum (equine roundworm, primary in foals), Strongylus vulgaris (large strongyle), Cyathostomum spp. (small strongyle, the most prevalent in adult horses), Oxyuris equi (pinworm) and Trichostrongylus axei (stomach worm); it also eliminates cestodes including Anoplocephala perfoliata (tapeworm) and Anoplocephala magna.
Clinical value: It relieves equine clinical symptoms such as colic, diarrhea, weight loss and poor coat condition caused by helminths, and is critical for preventing fatal complications (e.g., intestinal obstruction, blood vessel damage) from Strongylus vulgaris infection in foals. It is administered as an oral paste or granule for individual deworming of equines (every 6–8 weeks in high-risk seasons).
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