The mixture contains 250 mg of lactose as diluent.
Total mixture = 1.25 g
1x + 4x = 1.25 g
5x = 1.25g
x = 1.25 / 5
x = 0.25 g
lactose = 0.25 g = 250 milligram.
Thus in the mixture containing codeine sulfate, with lactose as an inert diluent, 250 mg of lactose is present.
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