Discharge head for a liquid dispenser, in particular for pharmaceutical liquids, with - a housing (20, 40) having a coupling portion for mounting on a liquid reservoir, - a discharge opening, and - a manually actuatable conveyor device for conveying liquid from the liquid reservoir to the discharge opening, wherein the conveyor device comprises a metering chamber with a cylindrical wall, and a piston that is adapted, in terms of the cross section, to the cylindrical wall of the metering chamber so as to allow a sliding movement thereon, wherein the metering chamber and the piston are able to be manually displaced, relative to each other, between a starting position and an end position, wherein - the metering chamber has an outlet side through which it is connected to the discharge opening, and an inlet side through which it is connected to the liquid reservoir, - the outlet side of the metering chamber is adjoined by an outlet chamber, and the inlet side of the metering chamber is adjoined by an inlet chamber, of which the cross section is in each case larger than the cross section of the piston, and - the piston is arranged in the inlet chamber when in the starting position and is arranged in the outlet chamber when in the end position, and, during the transition from the starting position to the end position, the liquid in the metering chamber is pressurized for the purpose of discharging liquid through the discharge opening, characterized in that the coupling portion for the liquid reservoir is connected to the conveyor device via two liquid paths (4, 6), wherein - a first liquid path leads from the coupling portion for the liquid reservoir, past the piston and into the inlet chamber or the outlet chamber, wherein this first liquid path is closed by the piston when the piston enters the metering chamber at the inlet side, and is opened when the piston emerges at the outlet side from the metering chamber, and - a second liquid path leads from the coupling portion for the liquid reservoir, through the piston and into the metering chamber, wherein an inlet valve that closes when there is an overpressure in the metering chamber is provided in the second liquid path. - a housing (20, 40) having a coupling portion for mounting on a liquid reservoir, - a discharge opening, and - a manually actuatable conveyor device for conveying liquid from the liquid reservoir to the discharge opening, - the metering chamber has an outlet side through which it is connected to the discharge opening, and an inlet side through which it is connected to the liquid reservoir, - the outlet side of the metering chamber is adjoined by an outlet chamber, and the inlet side of the metering chamber is adjoined by an inlet chamber, of which the cross section is in each case larger than the cross section of the piston, and - the piston is arranged in the inlet chamber when in the starting position and is arranged in the outlet chamber when in the end position, and, during the transition from the starting position to the end position, the liquid in the metering chamber is pressurized for the purpose of discharging liquid through the discharge opening, - a first liquid path leads from the coupling portion for the liquid reservoir, past the piston and into the inlet chamber or the outlet chamber, wherein this first liquid path is closed by the piston when the piston enters the metering chamber at the inlet side, and is opened when the piston emerges at the outlet side from the metering chamber, and - a second liquid path leads from the coupling portion for the liquid reservoir, through the piston and into the metering chamber, wherein an inlet valve that closes when there is an overpressure in the metering chamber is provided in the second liquid path.