An administering device for administering an active substance from a multi-chamber container comprising a first chamber holding a solid active substance and a second chamber holding a dissolving liquid for the active substance, wherein the administering device comprises a mixing device for mixing the active substance with the dissolving liquid and a housing accommodating the mixing device, the container being moveable relative to the housing, and the administering device further comprising a first indicator for indicating a position of the container relative to the housing upon completion of a mixing step, and a second indicator for indicating a position of the container relative to the housing upon completion of a venting step.