Beyond the neuro-psychiatric effects of specific dementia therapeutics, support given to patients and their informal carers is at stake today. One of the reasons why patients suffering from dementia are unable to remain at home is because their families are faced with so many difficulties. The study seeks to find out why elderly demented people are put into homes and what influences this decision. Patients' neuropsychiatric and therapeutic medical data have been linked to the socio-demographic data of both the patients and their carers and a complaint questionnaire for the latter has been devised regarding their day-today difficulties. The most frequent complaints of carers, when putting a relation into a institution, are incontinence and withdrawal. © Fondation Nationale de Gérontologie.