A device for mixing a liquid product and a solid to form an injecting product and for administering the product, including - a housing having a gripping portion for gripping it with a hand, - a receiving means, wherein the housing is in threaded engagement with the receiving means, - a two-chamber ampoule which is accommodated by the receiving means, which in particular is introduced into the receiving means from the distal end, wherein the two-chamber ampoule has a bypass, a first plunger and a second plunger, wherein the two plungers (45, 46) bear sealingly against a hollow-cylindrical housing portion of the two-chamber ampoule and can be displaced along the housing portion, wherein the two-chamber ampoule has the bypass in the region of the housing portion and forms an outward bulge and the bypass is axially longer than the first plunger, and - an outer sleeve having a gripping portion for gripping with another hand or an outer sleeve in the form of a gripping portion for gripping with another hand, wherein the outer sleeve extends over a part of the length of the receiving means and/or the two-chamber ampoule and the housing is arranged between the outer sleeve and the receiving means and is moveable relative to the receiving means into the outer sleeve, wherein the movement is a combined axial movement and rotary movement and by said movement the liquid product and the solid are mixed in the two-chamber ampoule to give the injecting product, wherein for mixing purposes a pressure is exerted on the second plunger, which is transmitted by way of the liquid product between the first plunger and the second plunger to the first plunger, wherein the second plunger is displaced in the axial direction to the first plunger into the region of the bypass, wherein when the first plunger is completely in the region of the bypass the liquid product flows past the first plunger through the bulge of the bypass and mixes with a solid arranged distally from the first plunger to give the injecting product. - a housing having a gripping portion for gripping it with a hand, - a receiving means, wherein the housing is in threaded engagement with the receiving means, - a two-chamber ampoule which is accommodated by the receiving means, which in particular is introduced into the receiving means from the distal end, wherein the two-chamber ampoule has a bypass, a first plunger and a second plunger, wherein the two plungers (45, 46) bear sealingly against a hollow-cylindrical housing portion of the two-chamber ampoule and can be displaced along the housing portion, wherein the two-chamber ampoule has the bypass in the region of the housing portion and forms an outward bulge and the bypass is axially longer than the first plunger, and - an outer sleeve having a gripping portion for gripping with another hand or an outer sleeve in the form of a gripping portion for gripping with another hand, wherein the outer sleeve extends over a part of the length of the receiving means and/or the two-chamber ampoule and the housing is arranged between the outer sleeve and the receiving means and is moveable relative to the receiving means into the outer sleeve, wherein the movement is a combined axial movement and rotary movement and by said movement the liquid product and the solid are mixed in the two-chamber ampoule to give the injecting product, wherein for mixing purposes a pressure is exerted on the second plunger, which is transmitted by way of the liquid product between the first plunger and the second plunger to the first plunger, wherein the second plunger is displaced in the axial direction to the first plunger into the region of the bypass, wherein when the first plunger is completely in the region of the bypass the liquid product flows past the first plunger through the bulge of the bypass and mixes with a solid arranged distally from the first plunger to give the injecting product.