n.hartmann, post #7: Coming back to post #5, because the follow-up matters more than the original answer. International pricing: the same compound costs very different amounts in different countries because healthcare systems and regulatory frameworks differ. Generally, US prices are higher than other developed nations.
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Worth separating two things that post #5 runs together.
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.