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Now it has been shown that antidepressants are pure placebo, we can wonder if antipsychotics are more than the expectancy off recovery1,2.
A placebo effect doesn’t mean that the treatment has no effect. Kirsch (2009) shows that placebo is much more effective than waiting list in treating depression.
In a meta-analysis, which also contained unpublished pharmaceutical industry sponsors trials, antidepressants were not ‘clinically significantly’ more effective than placebo. In experiments in which a placebo with side effects was used, there was no difference between antidepressant and placebo3.
In experiments it is required that participants are said that they can get a placebo or a drug and they are informed about the possible side effects. They and their physicians naturally ask themselves in which condition they are. If they perceive side-effects they believe they got the drugs so the experience a full placebo effect. If they believe to be in the placebo condition, because of lack of side effects, they experience a diminished placebo effect. So depression is now treatable without side effects. The exact form is subject to discussion.
Does this possibility also exist for schizophrenia?
A recent meta-analysis of published experiments comparing second generation antipsychotics with placebo found a small difference in response rate: 24% responded to placebo, 41% to the drug4. Disclosure/Conflict of interest shows that the writer of the meta-analysis had in the past received money from drug companies.
You can wonder what had happened if also the trials the drug companies are trying to hide were included in the meta analysis (as Kirsch has done for depression).
What would happen if antipsychotics are compared to an active placebo? Comparing antipsychotics with a non antipsychotic drug is not often done and has given conflicting results5.
There is a strange phenomenon that when two atypical antipsychotics are compared with each other, the drug of the company sponsoring the trial compares better than the drug of the competitor6.
A curious phenomenon is recently going on in drug trials with antipsychotics. At the same time as people were saying that new antipsychotics had less side effects, the placebo response is going up, so that in recent trials they don’t find a difference between drug and placebo also when they include an old drug beside placebo and a new drug7,8. Although drug companies7,8 see it as a problem with the experiments, it is very well possible that nowadays physicians and schizophrenics expect less side effects so that they are more willing to believe that someone receiving placebo is getting the real drug so that they experience a full placebo effect.
So maybe you can get rid of the side effects with a little bit of positive thinking. You think what you think you will think and you do what is expected of you9.
References:
1. http://www.nybooks.com/articles/archives/2011/jun/23/epidemic-mental-illness-why/
2. http://www.nybooks.com/articles/archives/2011/jul/14/illusions-of-psychiatry/
3. Kirsch (2009).The Emperor’s New Drugs: Exploding the Antidepressant Myth.
4. http://www.nature.com/mp/journal/v14/n4/abs/4002136a.html
5. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3230235/
6. http://www.psychservices.psychiatryonline.org/article.aspx?articleid=178035&RelatedWidgetArticles=true
7. http://schizophreniabulletin.oxfordjournals.org/content/36/3/504.short
8. http://www.cybermed.it/cybermedpdf/Placebo%20Response%20In%20Clinical%20Trials%20With%20Schizophrenia%20Patients.pdf
9. http://www.wired.com/medtech/drugs/magazine/17-09/ff_placebo_effect