Ivermectin Dosing for Hookworm in Adults
Ivermectin is not FDA-approved for hookworm treatment and shows poor efficacy at standard doses, with cure rates of only 11-68% even with repeated dosing. You should use albendazole 400 mg as a single dose or mebendazole 100 mg twice daily for 3 days instead, as these are the standard treatments for hookworm infection.
Why Ivermectin Is Not Recommended
The FDA label for ivermectin (Stromectol) only approves it for strongyloidiasis (200 mcg/kg) and onchocerciasis (150 mcg/kg), with no indication for hookworm infection 1.
Clinical evidence demonstrates ivermectin's poor performance against hookworms:
- Single-dose ivermectin 200 mcg/kg achieved only 11.8% cure rate for hookworm, compared to 95.5% for ascariasis in the same study 2
- Two doses of ivermectin 200 mcg/kg (10 days apart) achieved only 68% cure rate for hookworm, while achieving 99-100% cure rates for other helminths in the same population 3
- Even at the extremely high dose of 100 mcg/kg (single dose), cure rates were only 3.8% for hookworm 2
The Mechanism Problem
Ivermectin shows limited activity against adult hookworms in the intestinal tract. While it can expel some adult worms, it fails to eliminate infection consistently 2. Laboratory studies confirm that hookworms require doses 50-100 times higher than those needed for other nematodes to achieve clearance 4, making therapeutic dosing impractical and potentially toxic in humans.
What You Should Use Instead
Albendazole 400 mg single dose is the first-line treatment, with cure rates exceeding 90% for hookworm infection. Mebendazole 100 mg twice daily for 3 days is an effective alternative.
Important Caveat
If a patient has concurrent strongyloidiasis and hookworm, treat the strongyloidiasis with ivermectin 200 mcg/kg as a single dose 1, but you will still need to add albendazole or mebendazole specifically for the hookworm component, as the ivermectin dose for strongyloidiasis will not adequately treat hookworm co-infection 3.