Administering device comprising a main body, which has an outlet opening and a chamber for receiving a flowable substance to be administered, is made of a first film portion, which is preferably in the form of a first film, and a second film portion, which is connected to the first film portion and is preferably in the form of a second film and is preferably planar, and is designed such that the substance can be discharged through the outlet opening by compressing the chamber, characterized by a pouring adapter, which is tightly connected to the outlet opening and has a connector, wherein the connection between the first film portion and the second film portion seals off the chamber and has a plurality of regions, the plurality of regions of the connection comprise a more rigid region and a less rigid region arranged between the chamber and the outlet chamber of the outlet opening, the less rigid region of the connection is designed to detach when the chamber is compressed for discharging the substance through the outlet chamber of the outlet opening, and the more rigid region of the connection is designed to remain connected when the chamber is compressed for discharging the substance through the outlet chamber of the outlet opening and so, by compressing the chamber, the substance can be discharged virtually exclusively through the outlet chamber of the outlet opening and through the connector of the pouring adapter, wherein a part matching the desired administration type of the substance, such as syringing, dropping, applying or injecting, can be mounted on the connector of the pouring adapter, wherein the part comprises a pouring means, a droplet dispenser or an injection needle of a desired length, and wherein the pouring adapter has a sealing portion, which is arranged between the first film and the second film and is rigidly connected thereto, characterized in that, when viewed from the front, the sealing portion has a virtually triangular shape. has an outlet opening and a chamber for receiving a flowable substance to be administered, is made of a first film portion, which is preferably in the form of a first film, and a second film portion, which is connected to the first film portion and is preferably in the form of a second film and is preferably planar, and is designed such that the substance can be discharged through the outlet opening by compressing the chamber, characterized by a pouring adapter, which is tightly connected to the outlet opening and has a connector, wherein the connection between the first film portion and the second film portion seals off the chamber and has a plurality of regions, the plurality of regions of the connection comprise a more rigid region and a less rigid region arranged between the chamber and the outlet chamber of the outlet opening, the less rigid region of the connection is designed to detach when the chamber is compressed for discharging the substance through the outlet chamber of the outlet opening, and the more rigid region of the connection is designed to remain connected when the chamber is compressed for discharging the substance through the outlet chamber of the outlet opening and so, by compressing the chamber, the substance can be discharged virtually exclusively through the outlet chamber of the outlet opening and through the connector of the pouring adapter, wherein a part matching the desired administration type of the substance, such as syringing, dropping, applying or injecting, can be mounted on the connector of the pouring adapter, wherein the part comprises a pouring means, a droplet dispenser or an injection needle of a desired length, and wherein the pouring adapter has a sealing portion, which is arranged between the first film and the second film and is rigidly connected thereto, characterized in that, when viewed from the front, the sealing portion has a virtually triangular shape.