If they dislike the price controls and monopsonies that exist in other countries, they can avoid those markets entirely. Once they agree to participate and begin exporting their drugs, we should have every right to import them back at a discount. As large corporations have shown in the past, they have no issue with planned economies, as long as the planning is done in their favor (China, Dubai).
It is horribly unjust for Americans, many of whom have no or poor health insurance, to be forced to pay more money than anyone else on earth for prescription drugs. If Big Pharma, which spends disproportionate amounts of money on direct marketing to consumers, can't produce the medications we need cheaply and efficiently, that represents a market failure, and the government should step in and take the lead role in drug development. Research could be done through the NIH grant system and the results could be given away, unpatented, to the entire world. We could get the same results for less money, as the NIH doesn't need to make a profit and has no stock holders to answer to. It could even serve to improve our global reputation, showing the US to be a force for good in the world.