Cost per milligram is the only comparison that survives format differences, but even then it needs care. A pen and a vial are not the same product and cannot be compared on price per milligram alone because dead volume, wastage, and number of doses actually obtainable differ.
w.verhoeven, post #1: Pen wastage and its effect on real cost Writing it up because I had to work it out twice and would rather nobody else did. Two things I would like separated before anyone answers on pen wastage, because they get bundled and then argued about as one thing. The first is descriptive: what has actually been observed, by whom, and how. The… Go to post