Most of these went off patent years ago though. Why is it so hard to bring a generic drug to market? The drugs already have studies proving their efficacy, so the only issue should be a clean manufacturing process.
I guarantee there are manufacturers in the world who would be happy to have the business and could rapidly drive the price down to competitive generic levels again. But they are locked out by the bureaucracy.
http://marginalrevolution.com/marginalrevolution/2015/09/gen...