Treatment of Strongyloides stercoralis infection with ivermectin compared with albendazole: results of an open study of 60 cases

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Abstract
Ivermectin is highly effective against animal intestinal nematodes and is used in the treatment of onchocerciasis in humans. A study was undertaken to compare the efficacy of the drug with that of albendazole in the treatment of uncomplicated strongyloidiasis. Sixty patients with confirmed Strongyloides stercoralis infection were enrolled in an open randomized study and given either albendazole, 400 mg/d for 3 d or ivermectin, 150–200 μg/kg in a single dose. Efficacy and tolerance were evaluated on days 7, 30 and 90. Each visit included a parasitological examination of 3 stool specimens, using saline and Kato smears and formalin-ether and Baermann concentrations. Fifty-three patients were eligible for evaluation. Parasitological cure was obtained in 24 of the 29 patients treated with ivermectin (83%) and in 9 of the 24 patients who were given albendazole (38%); ivermectin was significantly more effective than albendazole (P < 0·01). Clinical and biological adverse reactions were negligible in both treatment groups. The 20 patients who failed therapy were given a second treatment course with 150–200 μg/kg of ivermectin in a single dose or on 2 consecutive days. Sixteen patients were cured and the other 4 had only incomplete follow-up. Ivermectin therefore constitutes an acceptable therapeutic alternative for uncomplicated strongyloidiasis.

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