The mixing cartridge comprises: —a cartridge body (1); —an actuation lever (5) —a fixed plate (2) placed within the cartridge body (1) and comprising inflow input openings and an output opening for the outflow of mixed water; and —a movable element comprising a movable plate (4) provided within the cartridge body, coupled to the actuation lever to be moved on or with respect to the fixed plate and internally defining a mixing chamber (41) open towards the fixed plate and which selectively communicates or blocks the communication of said input openings with the output opening. The mixing cartridge comprises a flow rate limiting arrangement placed within the cartridge body in the path followed by the water flow between said inflows and said outflow, so that the flow rate of said water is limited.