An apparatus (10) for dispensing respectively predetermined quantities of pulverulent contents (36) has a rotatably drivable metering roller (16) containing at least one metering chamber (54, 54.3), and a material store (34) which stores the pulverulent contents (36). The metering roller (16) contains at least one lateral line (24), which is not line-connected to the metering chamber (54) and of which the at least two line ends terminate on the surface of the metering roller. A gas line (44) is guided into the housing (12) and passes out of the housing again in a concave surface region (14). Gas can be introduced into the material store (34) via the lateral line (24), in dependence on the respective rotary position of the metering roller, through said gas line (44). In dependence on the rotary positions of the metering roller, the gas line (44) which serves for fluidizing the contents (36) present in the material store (34) is closed or opened by the metering roller (16).