Discharging unit for discharging pharmaceutical media from a medium storage receptacle, including a first discharge orifice, a pump, an inlet duct connecting the medium storage receptacle to the pump, and an outlet duct for connecting the pump to the first discharge orifice.The first discharge orifice is part of a first subordinate device of the discharging unit and the pump, a portion of the outlet duct, and an outlet valve provided in the outlet duct are part of a second subordinate device of the discharging unit. The first subordinate device is capable, without the use of tools, of being coupled to, and decoupled from, the second subordinate device, and an internal volume of a portion of the outlet duct extending from the outlet valve to the first discharge orifice is less than 15 μl.