The aim of this research is to investigate the role of the urban environment in the recovery process of psychosis. I look at the practices, spaces and temporalities of reconquering the city. I focus particularly on young people having recently experienced a first psychotic episode in the city of Lausanne, Switzerland. This analysis examines recovery from an ecological perspective that considers the city in its systemic dimension as a set of interactions between living beings, and spatially and temporally located milieus. I look at the way the constantly wavering temporal dynamics of psychosis affect people's practices. I show how these temporal dynamics imply various levels of involvement with the urban environment, which translates into the use of specific material, social, sensory and affective resources. First, my analysis outlines the process of reclaiming urban space while recovering. I highlight the great range and diversity of spaces mobilized by young people in their daily trajectories, which include institutional care spaces such as hospitals, community care centers or outpatient clinics, as well as more informal care settings such as parks or coffee shops. Second, I draw on the concept of "intensity of engagement" developed by Laurent Thévenot (2006), in order to point out how participants are constantly adjusting their involvement with the material, social, emotional and sensory resources of the environment, according to the frequency and intensity of symptoms. I argue that the temporal recovery dynamics of psychosis involve a short and a long cycle, implying an alternation of practices between withdrawal and reconquest of the urban space. Third, I develop a broader analysis that touches upon the strategies and tactics developed by people living with a diagnosis of psychosis when facing stressful situations in the city. In my concluding discussion, I show how the knowledge of practices, temporalities and spatialities of the recovery process provides a new line of thought for care professionals and urban planners, in order to rethink the livability of our cities and the quality of life of their inhabitants. More generally, this work is part of an interdisciplinary research project between psychiatry and human geography, funded by the Swiss National Research Foundation (SNSF), which aims to better understand the role of the urban environment in the emergence of psychosis. This analysis has been conducted with patients of an early intervention program for psychotic disorders called TIPP (Traitement et intervention précoce dans les troubles psychotiques) belonging to the Vaud University Hospital Centre (CHUV). My work is based on an ethnography conducted in a community care service with participants involved in the TIPP program, as well as on go-alongs, interviews and focus groups with another group of patients from the same program.