patient learning and advertising in the diffusion of cox 2 inhibitors pradeep k chintagunta renna jiang ginger z jin october 11 2006 preliminary incomplete comments welcome graduate school business university chicago email chicagogsb edu rjiang1 department economics maryland & nber econ umd we wish to thank greg crawford sean nicholson marta wosinska puneet manchanda participants at american society health economists conference for constructive suggestions all errors remain ours abstract recent withdrawal has generated debates on role informa tion drug can market learn efficacy new drugs or does it solely depend manufacturer fda updates this study use a novel data set quantify three celebrex vioxx bextra from 1999 2003 ipsos marketing research company tracked representative sample patients that recorded every prescription received starting january 2001 also collected information how satisfied is after she takes specific together with direct doctor