Treatment of Parasitic Infections Associated with Eosinophilia

General Treatment Principles

The treatment of parasitic infections associated with eosinophilia requires specific antiparasitic medications targeted to the causative organism, with albendazole, ivermectin, and praziquantel being the most commonly used first-line agents depending on the specific parasite identified 1, 2
Treatment selection depends on identifying the specific parasite through appropriate diagnostic testing including stool microscopy, serology, and travel history 2
For empirical treatment of asymptomatic eosinophilia with negative diagnostic workup, a combination of albendazole 400 mg single dose plus ivermectin 200 μg/kg single dose can be considered 2
Always exclude Loa loa infection before administering ivermectin in patients who have traveled to endemic regions, as severe reactions can occur 3

For strongyloidiasis, ivermectin 200 μg/kg daily for 2 days is the treatment of choice, and for hyperinfection syndrome in immunocompromised patients, extended treatment and specialist consultation is required 4, 1
Albendazole 400 mg twice daily for 7 days is an alternative but less effective treatment for strongyloidiasis 4
For ascariasis, albendazole 400 mg as a single dose is the recommended treatment 5
For hookworm infections, albendazole 400 mg as a single dose is the recommended treatment 2
For toxocariasis (Visceral larva migrans), albendazole 400 mg twice daily for 5 days is the recommended treatment, and for ocular or CNS involvement, add corticosteroids 3, 6
For trichinellosis, albendazole 400 mg daily for 3 days in mild disease, and longer courses for severe disease, with addition of corticosteroids for severe inflammatory reactions 7

For schistosomiasis, praziquantel 40 mg/kg in two divided doses for 1 day is the recommended treatment, and for acute schistosomiasis (Katayama syndrome) with neurological symptoms, start with corticosteroids alone before adding praziquantel 2, 8
For neuroschistosomiasis, praziquantel 40 mg/kg twice daily for 5 days plus dexamethasone 4 mg four times daily, tapering over 2-6 weeks is the recommended treatment 9
For liver flukes (Clonorchis, Opisthorchis), praziquantel 25 mg/kg three times daily for 2-3 days is the recommended treatment 8
For paragonimiasis, praziquantel 25 mg/kg three times daily for 2 days is the recommended treatment 2

For Taenia saginata/T. solium, praziquantel 10 mg/kg as a single dose is the recommended treatment, and for neurocysticercosis, albendazole plus corticosteroids, with specialist consultation is recommended 5, 8
For Hymenolepis nana, praziquantel 25 mg/kg as a single dose is the recommended treatment 5
For echinococcosis, complex management requiring specialist consultation, with albendazole 400 mg twice daily for prolonged periods, sometimes with praziquantel, and surgical or percutaneous interventions may be necessary 7

For onchocerciasis, ivermectin 200 μg/kg monthly for 3 months, then every 3-6 months until asymptomatic, with addition of doxycycline 200 mg daily for 6 weeks to target symbiotic Wolbachia bacteria is the recommended treatment 3
For lymphatic filariasis, diethylcarbamazine (DEC) with specialist advice, and exclude co-existing onchocerciasis before using DEC 6, 2

Immunocompromised patients are at higher risk of disseminated disease, particularly with strongyloidiasis, and may require longer treatment courses 1
For CNS involvement, add corticosteroids to prevent inflammatory reactions when treating neurocysticercosis or neuroschistosomiasis 8