Compound Transitions (m/z) CE (eV) CXP (eV) DP (eV) Citalopram 325.3→109.0 39 8 66 325.3→261.9 27 24 325.3→83.1 91 4 Desipramine 267.3→72.2 27 4 56 267.3→208.0 33 16 267.3→190.8 83 14 Collision energy (CE), collision exit potential (CXP) and declustering potential (DP). Transitions used for quantification are underlined.

Table 1: MRM parameters for each transition of citalopram and its internal standard.