No drug companies could sell at any price they wanted to, just not price discriminate. They would sell at any price they wanted to in the US, and the freeloaders in the other "rich" countries, would either pay the same price, adjusted for volume sale cost savings, or do without. Drug companies will always deem it mandatory to sell in the American market and will, and will have to, in order to fund drug research.
Ok, You basically want to apply Robinson-Patman to extraterritorial drug transactions. I wonder if the courts will agree that the govt. has this authority.