The "Alzheimer's disease" category, madness that has gradually been medicalized, presents a nosography that has evolved over time. In contrast, the category’s clinical practices of diagnosis and evaluation have experienced an astonishing continuity. Due to the uncertain etiology, the origin of this pathology remains unknown, and still today a treatment for Alzheimer's disease or tests to determine with certainty if a patient suffers from Alzheimer’s disease do not exist. Despite this, doctors have at least a protocol allowing them during the first visit to establish a possible or probable diagnosis for people considering themselves, or considered by their relative (companion), in cognitive and memory impairment, during follow-ups to assess patients for this type of impairment that is usually associated to Alzheimer's disease, and in both cases to prognosticate this disease by the use of a precise symptomatological grid. Following the "analytic mentality" that is specific to the Ethnomethodology and Conversation Analysis, which favours the dissolution of the micro/macro opposition, this linguistic and sociological, comprehensive and critical study of geriatric consultations set in French hospitals and filmed in 2008-2009 shows four moments of consultation (opening, tests, interviews, closing) crucial and specific to this type of encounter. Observing a variability of professional practices raises issues that go further than the questions generally addressed in interactional linguistic and comprehensive sociology analysis. A more critical sociological interpretation provides a different insight into the practice of professionals and takes into account the social order that is created during a consultation. It must be acknowledged that, despite the doctors’ professed intention to recognise their patients as partners by putting them at the heart of the clinical encounter, in fact the patient is not always heard by other actors present, all engaged in social power relations. Accordingly, asymmetries in the relationship of the doctor, patient and companion reveal in particular their negotiations in the organisation of exchanges and in decision-making. Medical domination is expressed first of all by the convergent orientation of the participants in the clinical encounter towards a medical objectivation of cognitive and memory impairment, participating in the process of doctorability of the patient's case and the legitimation of "Alzheimer's disease” as an operative medical category. This domination, based on the doctor’s legitimacy and authority, rests on the conditions of exchange, which are imposed on the participants and necessarily accepted by the patient and the companion; these conditions are operationalized during the consultation by the achievement of interactional procedures implemented for all diagnostic or evaluative purposes. In conclusion, the epistemic and interactional asymmetry is a gateway to observe medical domination at a categorical, social and societal level. The need for participants to perform face work at various times and at times the doctors’ perseverance to continue their undertaking of doctorability while the patient resists to make his case a doctorable one, underline subsequently that geriatric consultations aimed at the diagnostication and the evaluation of Alzheimer's disease represent places affected by symbolic, clinical, therapeutic violence.