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In the context of primary care transformations, a large number of schemes aimed at coordinating multi-professional practice have been implemented. Among these, the microstructures médicales addictions (MSMA) bring together general practitioners (GPs), psychologists, social workers and coordinators, in order to improve the territorial network of care and access to local care for patients of GPs presenting situations of addiction and great precariousness. This article examines the conditions and possibilities of this collaboration by questioning the division of care work. It is based on a survey that targets the practices of these professionals mainly in three MSMAs operating in health care centers, multidisciplinary group practice and private practices. This case shows the resistance of non-physicians to being controlled by doctors in the organization of their work (times of intervention and scope of tasks), without this disrupting the stabilization of cooperation in care.