Subjective Factors of Polymedication in the Elderly: a Qualitative Study of the Perceptions of Patients, Relatives and Referent Physicians.(DOSAGE)

Inclusion Criteria: * For patients: * Men and women aged 75 and over * Beneficiary of a prescription of medicinal products fulfilling the conditions of major polymedication: to include 10 different drugs whatever the way of use (per os, subcutaneous, intravenous, intra muscular, cutaneous, instillation) * Informed consent stating that the subject understood the purpose and methodology of the study and agrees to participate in the study. * For the relatives: * Men and women 18 years of age or older * Informed consent * Regularly participating in helping the patient's daily life * For Physicians : * Identified as the patient's physician or family physician. * Informed consent Exclusion Criteria: * Persons with proven and significant cognitive impairment preventing the completion of semi-strutured interviews * Person who does not speak French easily * Generally, any person unlikely to cooperate in the study * Adults under guardianship * Refusal of relatives and/or general practitioner to participate to the study