Merck Manual

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Anthelmintic Treatments for Lungworms a

Anthelmintic Treatments for Lungworms a




Dictyocaulus viviparus


Ivermectin, doramectin, moxidectin, eprinomectin (0.2 mg/kg, PO, or 0.5 mg/kg, topical)

Fenbendazole (5 mg/kg, PO)

Albendazole (7.5–10 mg/kg, PO)

Oxfendazole (4.5 mg/kg, PO)

D filaria, M capillaris

Sheep, goat

Ivermectin, moxidectin (sheep: 0.2 mg/kg, PO; goats: 0.4 mg/kg, PO)

Fenbendazole (sheep: 5–7.5 mg/kg, PO; goats: 10 mg/kg, PO)

Albendazole (sheep: 7.5 mg/kg, PO; goats: 10 mg/kg, PO)

D filaria, D viviparus

Alpaca, llama

Ivermectin (0.2 mg/kg, POc)

D arnfieldi

Donkey, horse

Ivermectin (donkey, horse: 0.2 mg/kg, PO), moxidectin (0.4 mg/kg, POc)

Metastrongylus spp


Ivermectin, doramectin (0.3 mg/kg, SC)

Fenbendazole (9 mg/kg, mixed in feed, for 3–12 days)

Aelurostrongylus abstrusus


Fenbendazole (50 mg/kg, PO, for 2–5 days)

Emodepside (3 mg/kg, topical)

Eprinomectin (0.5 mg/kg, topical), moxidectin (1 mg/kg, topical), selamectin (6 mg/kg, topical)

Oslerus osleri


Fenbendazole (50 mg/kg, PO, q24h for 10–14 days)

Ivermectin (0.2–0.3 mg/kg, may need up to three doses)

Eucoleus aerophilus

Dog, cat

Fenbendazole (dog: 50 mg/kg, PO, q24h for 14 days)

Eprinomection (cat: 0.5 mg/kg, topical), moxidectin (cat: 1 mg/kg, topical)

Crenosoma vulpis


Fenbendazole (50 mg/kg, PO, q24h for 3 days)

Milbemycin oxime (0.5 mg/kg, PO)

Moxidectin (2.5 mg/kg, topical)

a In severe cases, anti-inflammatories may also be helpful.

b Dose depends on the product and the species. Sustained-release devices are not included. Always follow manufacturers' recommendations, including withdrawal times as applicable. Depending on parasite species, multiple treatments may be needed. Be aware that some recommendations constitute off-label use.

c Anecdotal evidence for efficacy but no published evidence.