We all hear about the new drugs that have just been approved, and we all keep track of the drugs that are coming off patent. But what about the really old ones, the drugs that made it to the market long before today's regulatory framework? There have long been medicines that are generally recognized as reasonably safe and effective, but have never been through much of the modern process.
The FDA has, for the last few years, been trying to catch up on these things, and has offered exclusivity to any manufacturers who are willing to run clinical trials on older medicines. But this hasn't always worked out the way that it was intended - witness the case of colchicine, a well-known natural product drug that's used for some inflammatory diseases (and used to be a chemotherapy agent, too). The Wall Street Journal has a good story on this.
URL Pharma, a generic manufacturer, took the time and trouble to get fresh data on colchicine for gout attacks, and was granted a three-year marketing exclusivity period. So far, so good - but they then turned around and ran the price up by a factor of fifteen. They also filed suit against other small companies that were selling colchicine in the generic market, with the result that other domestic sources of the drug might dry up (four of the other companies are fighting back in court).
So is this the advent of evidence-based medicine, coming to an area that had little of it before, and therefore a good thing? Is it an abuse of the system by a company that saw an opportunity to suddenly acquire pricing power? Is it just what the FDA should have expected, given that three years of marketing rights have to make up for the cost of the clinical work, with the profits likely to disappear immediately afterwards? I think it's going to be hard to have it both ways. If you expect companies to go back and fill in the clinical profile of older drugs, you do need give them some incentive to do it. But then what's to keep them from pounding that incentive in good and hard, as seems to be happening here?
I'm not sure how to split that difference, especially not with any general rule, because each case will probably be different. The new clinical trials might, in fact, uncover something really useful that was previously unknown - or they might just confirm that the way the drug was being dosed was, in fact, just the way it should be dosed. One of those seems more deserving of compensation than the other, but there's no way of knowing which result you're going to get a priori. I have an aversion to telling a company how much it can charge for a drug, but it's not like URL Pharma discovered colchicine, or had to do any of the risky early-stage work on it. I can justify some pricing moves (although not all of them) by companies that are doing discovery research, because so much of that doesn't lead to anything marketable. (Take, for example, virtually everything I've worked on my whole career). But a generic company that's coming in to dot the Is and cross the Ts on the FDA paperwork is something else again.
Perhaps if the FDA really feels that backfilling the regulatory work on drugs that no one owns in particular is important enough, they should fund the work themselves. But that opens up issues of its own, too.