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February 29, 2012
You'll have seen the news about the FDA safety warning on statins. The agency is warning that instances of hyperglycemia have occurred with statin use, as well as memory loss and confusion.
I'm really not sure what to make of this. On the one hand, these drugs have been through many, many large clinical trials under controlled conditions, and they've been taken by a huge numbers of patients out in the real world. So you might think that if these effects were robust, that they might have been noticed before now. But there are side effects that are below the threshold of even the largest clinical trials, and a patient population the size of the one taking these drugs is just where you might be able to see such things.
I lean towards the latter, and if that's true, then the agency's statement is appropriate. If these could be real effects in some patients, then it's worth keeping an eye out for them. One problem, though, is that hyperglycemia is rather more sturdy. You can measure it, and people don't really feel it when they have it. Memory loss and confusion are fuzzier, but they're immediately felt, so they're subject to more post hoc ergo propter hoc judgments. It's possible that more people will stop taking statins because of that part of the warning to cancel out the public health good that it might do otherwise.
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