Eighty-two horses received fenbendazole ( 10.0 mg/kg [ 4.5 mg/lb ] , PO , q 24 h for 5 days ) or moxidectin ( 0.4 mg/kg [ 0.18 mg/lb ] , PO , once ) ; FEC data were analyzed 14 , 45 , and 90 days after treatment .