Ivermectin levels were measured in breastmilk and plasma of 4 healthy
mothers after an oral 150 mug/kg dose. Mean +/- S.D. plasma and milk v
alues were 37.9 +/-0.54 and 14.13 +/- 0.43 (ng/ml) respectively. Stead
y-state ivermectin levels in milk were low. Our results suggest that e
xclusion of lactating mothers from mass chemotherapy with ivermectin m
ay be unnecessary.