Correction: the price of testing drugs is mostly due to the bribes that need to be applied for them to be approved and the patents granted.
About the closest thing to a bribe you'll see in first-world drug development is the payments to the doctors who participate in the clinical trials. That is actually a considerable part of the trial costs. The payment can't induce them to manipulate the trial results, since the doctors don't have the ability to do this (the trials are double-blind - if they lied and said the patient was doing better than they actually were it would just affect the placebo group as much). However, if you don't throw money at doctors they won't bother to tell their patients about the option of participating in the trial.
Unfortunately, sometimes the money does cause doctors to enroll patients for whom the trials are inappropriate. Companies actually try to stop this, because it is likely to result in a drug NOT being approved (if you give a pill to somebody who is not expected to benefit from it, you add noise to the data which is already quite noisy).
So, while lots of money in the pharma industry gets spent on lots of stuff, the fact remains that it does cost hundreds of millions of dollars to test drug candidates, and most of the time the testing demonstrates that the drug is not safe/effective.
Oh, I'm all for having the NIH competitively do drug development/testing/etc (and making the resulting drugs freely licensable within the US, for use in 3rd world countries, and in 1st world countries that make similar investments and reciprocate). However, I don't think that it will magically make the testing less expensive, unless the whole healthcare system changes so that doctors can be compelled to participate in trials without much additional compensation (that is something that would be more likely to work in a country with nationalized healthcare, though it is worth pointing out that clinical trials tend to happen on a global scale anyway).
In the drug industry the patent system is in part used to let the high-risk/high-cost of development pay for itself. A tweaked molecule might not be very innovative, but it is just as expensive to test. If rulings like this prevail then you simply won't see tweaked molecules developed using private money, even if the resulting drug is a substantial improvement for patients. Again, there are other ways to fund drug development, but I'd like to see those methods employed and demonstrated as successful before we just pull the plug on the drug industry. There is no reason that publicly funded efforts can't just compete with the private ones - the public drugs would be much cheaper for consumers so they'll have no trouble if the R&D labs manage to come up with the goods. The pharma industry has been laying off so many scientists of late that the NIH shouldn't have trouble hiring some...
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/s_IWrOoYVM0/story01.htm
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