Cianopramine is a highly potent inhibitor of neuronal serotonin (5-HT) uptake developed by Hoffmann-La Roche for major depression treatment. In preclinical studies, acute and chronic treatment with Cianopramine shows clear behavioural effects Cianopramine increases neophobic reactions in the free exploration test, the avoidance reaction to a brightly illuminated chamber in the light/dark choice procedure as well as to open arms in the elevated plus-maze test. In a double-blind trial, Cianopramine effective in reducing scores on the Hamilton Psychiatric Rating Scale for Depression and on a global scale. Unfortunately, Cianopramine administrations were associated with significant adverse effects and future development was discontinued.