Thanks to Chris (my brother in pharmacy school) for passing this along. I love stories like this where people question conventional wisdom and the theories and studies that made it become conventional, especially when they appear to be doing objective research and then get criticized by their peers. This article reminds me last week’s post related to diet and exercise.
Studies suggest that the popular drugs are no more effective than a placebo. In fact, they may be worse.
Although the year is young, it has already brought my first moral dilemma. In early January a friend mentioned that his New Year's resolution was to beat his chronic depression once and for all. Over the years he had tried a medicine chest's worth of antidepressants, but none had really helped in any enduring way, and when the side effects became so unpleasant that he stopped taking them, the withdrawal symptoms (cramps, dizziness, headaches) were torture. Did I know of any research that might help him decide whether a new antidepressant his doctor recommended might finally lift his chronic darkness at noon?
The moral dilemma was this: oh, yes, I knew of 20-plus years of research on antidepressants, from the old tricyclics to the newer selective serotonin reuptake inhibitors (SSRIs) that target serotonin (Zoloft, Paxil, and the granddaddy of them all, Prozac, as well as their generic descendants) to even newer ones that also target norepinephrine (Effexor, Wellbutrin). The research had shown that antidepressants help about three quarters of people with depression who take them, a consistent finding that serves as the basis for the oft-repeated mantra "There is no question that the safety and efficacy of antidepressants rest on solid scientific evidence," as psychiatry professor Richard Friedman of Weill Cornell Medical College recently wrote in The New York Times. But ever since a seminal study in 1998, whose findings were reinforced by landmark research in The Journal of the American Medical Association last month, that evidence has come with a big asterisk. Yes, the drugs are effective, in that they lift depression in most patients. But that benefit is hardly more than what patients get when they, unknowingly and as part of a study, take a dummy pill—a placebo. As more and more scientists who study depression and the drugs that treat it are concluding, that suggests that antidepressants are basically expensive Tic Tacs.
Hence the moral dilemma. The placebo effect—that is, a medical benefit you get from an inert pill or other sham treatment—rests on the holy trinity of belief, expectation, and hope. But telling someone with depression who is being helped by antidepressants, or who (like my friend) hopes to be helped, threatens to topple the whole house of cards. Explain that it's all in their heads, that the reason they're benefiting is the same reason why Disney's Dumbo could initially fly only with a feather clutched in his trunk—believing makes it so—and the magic dissipates like fairy dust in a windstorm.
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To be sure, the drugs have helped tens of millions of people, and Kirsch certainly does not advocate that patients suffering from depression stop taking the drugs. On the contrary. But they are not necessarily the best first choice. Psychotherapy, for instance, works for moderate, severe, and even very severe depression. And although for some patients, psychotherapy in combination with an initial course of prescription antidepressants works even better, the question is, how do the drugs work? Kirsch's study and, now, others conclude that the lion's share of the drugs' effect comes from the fact that patients expect to be helped by them, and not from any direct chemical action on the brain, especially for anything short of very severe depression.
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Two other factors are at work in the widespread rejection of Kirsch's (and, now, other scientists') findings about antidepressants. First, defenders of the drugs scoff at the idea that the FDA would have approved ineffective drugs. (Simple explanation: the FDA requires two well-designed clinical trials showing a drug is more effective than a placebo. That's two, period—even if many more studies show no such effectiveness. And the size of the "more effective" doesn't much matter, as long as it is statistically significant.) Second, doctors see with their own eyes, and feel with their hearts, that the drugs lift the black cloud from many of their depressed patients. But since doctors are not exactly in the habit of prescribing dummy pills, they have no experience comparing how their patients do on them, and therefore never see that a placebo would be almost as effective as a $4 pill. "When they prescribe a treatment and it works," says Kirsch, "their natural tendency is to attribute the cure to the treatment." Hence the widespread "antidepressants work" refrain that persists to this day.
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The boy who said the emperor had no clothes didn't endear himself to his fellow subjects, and Kirsch has fared little better. A nascent collaboration with a scientist at a medical school ended in 2002 when the scientist was warned not to submit a grant proposal with Kirsch if he ever wanted to be funded again. Four years later, another scientist wrote a paper questioning the effectiveness of antidepressants, citing Kirsch's work. It was published in a prestigious journal. That ordinarily brings accolades. Instead, his department chair dressed him down and warned him not to become too involved with Kirsch.
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Right about here, people scowl and ask how anti-depressants—especially those that raise the brain's levels of serotonin—can possibly have no direct chemical effect on the brain. Surely raising serotonin levels should right the synapses' "chemical imbalance" and lift depression. Unfortunately, the serotonin-deficit theory of depression is built on a foundation of tissue paper. How that came to be is a story in itself, but the basics are that in the 1950s scientists discovered, serendipitously, that a drug called iproniazid seemed to help some people with depression. Iproniazid increases brain levels of serotonin and norepinephrine. Ergo, low levels of those neurotransmitters must cause depression. More than 50 years on, the presumed effectiveness of antidepressants that act this way remains the chief support for the chemical-imbalance theory of depression. Absent that effectiveness, the theory hasn't a leg to stand on. Direct evidence doesn't exist. Lowering people's serotonin levels does not change their mood. And a new drug, tianeptine, which is sold in France and some other countries (but not the U.S.), turns out to be as effective as Prozac-like antidepressants that keep the synapses well supplied with serotonin. The mechanism of the new drug? It lowers brain levels of serotonin. "If depression can be equally affected by drugs that increase serotonin and by drugs that decrease it," says Kirsch, "it's hard to imagine how the benefits can be due to their chemical activity."
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Which returns us to the moral dilemma. In any year, an estimated 13.1 million to 14.2 million American adults suffer from clinical depression. At least 32 million will have the disease at some point in their life. Many of the 57 percent who receive treatment (the rest do not) are helped by medication. For that benefit to continue, they need to believe in their pills. Even Kirsch warns—in boldface type in his book, which is in stores this week—that patients on antidepressants not suddenly stop taking them. That can cause serious withdrawal symptoms, including twitches, tremors, blurred vision, and nausea—as well as depression and anxiety. Yet Kirsch is well aware that his book may have the same effect on patients as dropping the magic feather did for Dumbo: without it, the little elephant began crashing to earth. Friends and colleagues who believe Kirsch is right ask why he doesn't just shut up, since publicizing the finding that the effectiveness of antidepressants is almost entirely due to people's hopes and expectations will undermine that effectiveness.
It's all well and good to point out that psychotherapy is more effective than either pills or placebos, with dramatically lower relapse rates. But there's the little matter of reality. In the U.S., most patients with depression are treated by primary-care doctors, not psychiatrists. The latter are in short supply, especially outside cities and especially for children and adolescents. Some insurance plans discourage such care, and some psychiatrists do not accept insurance. Maybe keeping patients in the dark about the ineffectiveness of antidepressants, which for many are their only hope, is a kindness.
Or maybe not. As shown by the explicit criticism of drug companies by the authors of the recent JAMA paper, more and more scientists believe it is time to abandon the "don't ask, don't tell" policy of not digging too deeply into the reasons for the effectiveness of antidepressants. Maybe it is time to pull back the curtain and see the wizard for what he is. As for Kirsch, he insists that it is important to know that much of the benefit of antidepressants is a placebo effect. If placebos can make people better, then depression can be treated without drugs that come with serious side effects, not to mention costs. Wider recognition that antidepressants are a pharmaceutical version of the emperor's new clothes, he says, might spur patients to try other treatments. "Isn't it more important to know the truth?" he asks. Based on the impact of his work so far, it's hard to avoid answering, "Not to many people."
