Just how big a problem was unclear, however, because FDA hears about only a tiny
fraction of adverse events from the companies, they noted.
It is left to the FDA's drug division to determine whether they are unsafe after they are on the market — a difficult task since the
adverse event reports are generally considered to represent only a
fraction of the actual incidents and may lack sufficient information to allow for thorough investigations.
Afifi, T.O., Enns, M.W., Cox, B.J., Asmundson, G.J.G., Stein, M.B. and Sareen, J. (2008) Population attributable
fractions of psychiatric disorders and suicidal ideation and attempts associated with
adverse childhood
events in the general population.