Administering apparatus with functional drive element

A device for administering a fluid product, comprising:

• a) a housing;
• b) an accommodating member for a reservoir for containing the fluid product, wherein the accommodating member can be inserted relative to the housing along a longitudinal axis of the housing from an initial position to an inserted position, wherein the reservoir is a two-chamber reservoir comprising a first stopper and a second stopper, the two-chamber reservoir adapted for mixing an active agent and a solvent;
• c) a drive member mounted in the housing and moveable relative to the accommodating member to deliver the fluid product from the reservoir;
• wherein
• d) the drive member comprises at least one flexibly joined holding element, wherein the holding element is moveable from a holding position, in which the holding element holds the drive member against movement relative to the housing, into a released position, in which the drive member can be moved relative to the housing;
• and
• e) as the accommodating member moves from the initial position to the inserted position by inserting the accommodating member into the housing, the holding element is in the holding position and the drive member abuts against and shifts at least one of the stoppers relative to the accommodating member until the accommodating member is in a mixing position or a venting position, and upon the accommodating member reaching the inserted position, the holding element is radially flexed by an end of the accommodating member and in the released position.