Gastric emptying of a mixed nutrient liquid meal was assessed by measuring acetaminophen levels predose and at 0.25 , 0.5 , 0.75 , 1 , 1.25 , 1.5 , 2 , 3 , 3.5 , 4 , 5 , 6 , 8 , 10 , 12 , and 14 hours after administration of 1000 mg acetaminophen on Days 0 and 10 .