Tolerance and Efficacy of Single High-Dose Ivermectin for the Treatment of Loiasis

Yves Martin-Prevel Centre International de Recherches Medicales de Franceville, Merck Sharp and Dohme Research Laboratories, Franceville, Gabon

Search for other papers by Yves Martin-Prevel in
Current site
Google Scholar
PubMed
Close
,
Jean-Yves Cosnefroy Centre International de Recherches Medicales de Franceville, Merck Sharp and Dohme Research Laboratories, Franceville, Gabon

Search for other papers by Jean-Yves Cosnefroy in
Current site
Google Scholar
PubMed
Close
,
Paul Tshipamba Centre International de Recherches Medicales de Franceville, Merck Sharp and Dohme Research Laboratories, Franceville, Gabon

Search for other papers by Paul Tshipamba in
Current site
Google Scholar
PubMed
Close
,
Paul Ngari Centre International de Recherches Medicales de Franceville, Merck Sharp and Dohme Research Laboratories, Franceville, Gabon

Search for other papers by Paul Ngari in
Current site
Google Scholar
PubMed
Close
,
Jeffrey A. Chodakewitz Centre International de Recherches Medicales de Franceville, Merck Sharp and Dohme Research Laboratories, Franceville, Gabon

Search for other papers by Jeffrey A. Chodakewitz in
Current site
Google Scholar
PubMed
Close
, and
Margaret Pinder Centre International de Recherches Medicales de Franceville, Merck Sharp and Dohme Research Laboratories, Franceville, Gabon

Search for other papers by Margaret Pinder in
Current site
Google Scholar
PubMed
Close
Restricted access

A study was carried out in southeastern Gabon to evaluate the tolerance and efficacy of single high doses of ivermectin in 31 Loa loa-infected subjects with low-to-moderate parasitemia (7–7,700 microfilaria/ml). The first group of 16 subjects received 300 µg/kg of ivermectin and, seven days later, a second group of 15 received 400 µg/kg. Complete clinical and biological monitoring was carried out during the first 10 days post-treatment and again after one and three months. All subjects continued with their usual activities during the study. The clinical tolerance of treatment was very good, and except in one case, only mild adverse reactions were observed, with pruritus being the most common symptom. There were no significant changes in blood or urine function test results or in hematologic results, except for a pronounced eosinophil reaction. The 400 µg/kg dose of ivermectin equaled or surpassed in tolerance that of 300 µg/kg dose. After treatment, L. loa microfilaremia decreased rapidly to less than 9% of the pretreatment value by day 10. This decrease was enhanced with the 400 µg/kg dose, although differences between the two groups diminished slightly with time. At 100 days post-treatment, the microfilaremia was still at less than 10% of the initial values in the two groups, which may indicate an effect of ivermectin on the adult worms.

Author Notes

Save