Discharge head (110; 210) for mixing two starting media and for discharging the mixed liquid that is thereby generated, with the following features: a. the discharge head has a dosing chamber which is delimited by dosing-chamber walls on a base of the discharge head and on a displacer, and b. the discharge head has a first inlet, through which a first of the two starting media can flow into the dosing chamber, and c. the discharge head has a second inlet, through which a second of the two starting media can flow into the dosing chamber, d. the discharge head has an outlet through which the mixed liquid can be discharged from the dosing chamber, and e. the displacer is manually movable relative to the base in an actuation direction between a first end position and a second end position, such that, during the movement of the displacer from the first end position to the second end position, the volume of the dosing chamber is reduced and the mixed liquid is forced out through the outlet, characterized by the following feature: f. the dosing chamber has a volume-compensating mechanism, and g. the volume-compensating mechanism has a deflectable dosing-chamber wall portion which delimits the dosing chamber and which is deflectable, with respect to the first end position of the displacer relative to the base, between a minimal position, in which it does not enlarge the volume of the dosing chamber, and a maximal position (63"), in which it enlarges the volume of the dosing chamber to a maximum extent, and, h. by virtue of the deflection of the deflectable dosing-chamber wall portion in the direction of the maximal position (63"), an auxiliary volume is made available in the dosing chamber through which, with the dosing chamber already filled with the first starting medium, the second starting medium can still be introduced into the dosing chamber. a. the discharge head has a dosing chamber which is delimited by dosing-chamber walls on a base of the discharge head and on a displacer, and b. the discharge head has a first inlet, through which a first of the two starting media can flow into the dosing chamber, and c. the discharge head has a second inlet, through which a second of the two starting media can flow into the dosing chamber, d. the discharge head has an outlet through which the mixed liquid can be discharged from the dosing chamber, and e. the displacer is manually movable relative to the base in an actuation direction between a first end position and a second end position, such that, during the movement of the displacer from the first end position to the second end position, the volume of the dosing chamber is reduced and the mixed liquid is forced out through the outlet, f. the dosing chamber has a volume-compensating mechanism, and g. the volume-compensating mechanism has a deflectable dosing-chamber wall portion which delimits the dosing chamber and which is deflectable, with respect to the first end position of the displacer relative to the base, between a minimal position, in which it does not enlarge the volume of the dosing chamber, and a maximal position (63"), in which it enlarges the volume of the dosing chamber to a maximum extent, and, h. by virtue of the deflection of the deflectable dosing-chamber wall portion in the direction of the maximal position (63"), an auxiliary volume is made available in the dosing chamber through which, with the dosing chamber already filled with the first starting medium, the second starting medium can still be introduced into the dosing chamber.