> A vial of NovoLog, one type of insulin, costs15 anywhere from $14 to $300 in the United States but only $48 in Singapore, $14 in India, $6 in Austria, and $0 in Italy.

I think a reasonable solution without having to dictate details is to require pharmaceutical companies give the US most favored nation status - that is they must provide the US the same price as the country where it is sold for the cheapest. Perhaps you exclude developing nations from that calculation.