Method for preparing citalopram purified

Method for preparing citalopram purified, characterized in that the crude citalopram product is optionally subjected to further purification; and the crude citalopram base is subsequently subjected to a film distillation process for removing impurities from the reaction of high molecular weight; then the resulting citalopram product is optionally further purified form and is prepared and isolated as the base or a pharmaceutically acceptable salt thereof.