A report just published in the New England Journal of Medicine says that nearly a third of antidepressant drug studies are never published in the medical literature and nearly all these unpublished studies happen to show that the drug being tested did not work.
The researchers say it in the most polite and unaccusative way, but the obvious interpretation is that if a drug study comes up negative then the drug companies hide it.
The report found that the few negative studies that were published were rewritten to present the study as if it were successful. In the words of the researchers, "Not only were positive results more likely to be published, but studies that were not positive, in our opinion, were often published in a way that conveyed a positive outcome."
As I said the researchers were very polite, but not me. As far as I'm concerned Big Pharma is hiding the negative results because they think it will hurt their profits. They don't care that their drugs harm people, they only care if something harms their profits.
Read about the study here: Data on Antidepressants Often Shelved