Alzheimer's disease (AD) and other related dementias are characterized by neuropsychological and neurological deficits associated with behaviour problems. Symptomatic treatments are most efficient in the early stages of disease. A prompt diagnosis and early initiation of treatment are crucial for optimal results. However, AD has often been underrecognized and therefore undertreated in the primary care setting in France. Behavioural disturbances are also important manifestations, because they are associated with caregiver distress, thus increasing the likelihood of institutionalization, and may be associated with more rapid cognitive decline.