| Impurity | Name | CAS | MF | MW |
| Escitalopram | (S)-CITALOPRAM S-(+)-1-3-(dimethyl-amino) propyl-1-(p-fluorophenyl)-5-phthalancarbonitrile | 128196-01-0 | C20H21FN2O | 423.325 |
| A | 1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-5-isobenzofuran-carbonitrile | 59729-33-8 | C20H21FN2O | 324.398 |
| D | desmethylcitalopram hydrochloride | no | C19H19FN2O*ClH | 346.832 |
| G | 4-(1,7-bis(dimethylamino)-4-hydroxyheptan-4-yl)-3-(hydroxymethyl)benzonitrile | no | C19H31N3O2 | 333.47 |
| H | 4-carbamoyl-2-(hydroxymethyl)benzoic acid | no | C9H9NO4 | 195.17 |
| I | (R)-1-(3-(dimethylamino)propyl)-1-(4-fluorophenyl)-1,3-dihydroisobenzofuran-5-carboxamide | no | C20H23FN2O2 | 342.41 |
| K | 4-(4-(dimethylamino)-1-(4-fluorophenyl)-1-hydroxybutyl)-3-(hydroxymethyl) benzamide | no | C20H25FN2O3 | 360.429 |
| L | 1-oxo-1,3-dihydroisobenzofuran-5-carboxamide | 85118-25-8 | C9H7NO3 | 177.159 |
| M | Z-4-(4-dimethylamino-1-(4-fluorophenyl)-but-1-enyl)-3-hydroxymethyl-benzonitrile | no | C20H21FN2O | 324.398 |
| N | 4-(bis(4-fluorophenyl)(hydroxy)methyl)-3-(hydroxymethyl)benzonitrile | no | C21H15F2NO2 | 351.35 |
