A dispensing device includes at least one bottle provided at its end remote from its bottom with a dispensing opening closed by a frangible end fitting and it also includes a cap fitted on the bottle on the side of adjacent said dispensing opening. The cap includes at least one shoulder intended to entrain said frangible end fitting as the cap is displaced, so as to release the dispensing opening. The cap also includes a discharge passageway issuing outside the device and communicating with the dispensing opening of the bottle in a position of the cap where the frangible end fitting is released from the dispensing opening.