“…However, a death due to overdose of citalopram, one of the SSRI drugs, was reported in 2005 [2]. SSRI drugs have been analyzed by gas chromatography-mass spectrometry (GC-MS) with derivatization [3], high-performance liquid chromatography [4,5], liquid chromatography (LC)-MS [6][7][8], and LC-MS-MS [9][10][11][12][13][14][15][16][17][18]. In this study, we combined an LC-MS-MS instrument with a new polymer column, which enables direct injection of crude biological samples without complicated pretreatments and without a column switching system.…”