A portable medical device for the dosed administration of a liquid medication, said device comprising: a) a first housing with a reservoir unit having an outlet into a fluid path for conducting the medication, which is downstream of said reservoir unit, b) a second housing with a conveying unit for the dosed dispensing of the medication from the reservoir unit and suitable means for controlling said conveying unit, c) an adapter (3a, 3c) with an adapter plate and with coupling means (5; 20, 23) for receiving the first housing with the reservoir unit and the second housing with the conveying unit, d) and attachment means in the form of a detachable adhesive bond or a skin patch so that the adapter (3a, 3c) can be carried extracorporeally on the patient by direct attachment to the surface of the patient's skin by placing the adapter plate of the adapter (3a, 3c) directly on the skin surface, c') a further adapter (3b, 3d) having an adapter plate and coupling means (5; 20, 23) for receiving the first housing with the reservoir unit and the second housing with the conveying unit, d') and attachment means (8, 21) in the form of connecting means (8, 21) to a carrying system for carrying the further adapter (3b, 3d) extracorporeally on the patient such that it is worn on an article of clothing with the adapter plate of the further adapter (3b, 3d) placed on the article of clothing, d") wherein the further adapter (3b, 3d), preferably the adapter plate (3b, 3d) of the further adapter, is connected to a disconnectable catheter head via a catheter line for the infusion of the medication, e) wherein the conveying unit and the reservoir unit can be combined into a complete mechanical and fluidic unit, preferably at least substantially without the use of tools, f) and can optionally be coupled with the adapter (3a, 3c) or the further adapter (3b, 3d) and decoupled from the adapter (3a, 3c) or the further adapter (3b, 3d) and thereby can optionally be combined with the adapter (3a, 3c) or the further adapter (3b, 3d) into a complete mechanical and fluidic unit, preferably at least substantially without the use of tools, h) wherein the adapter (3a, 3c) and the further adapter (3b, 3d) each establishes a fluid connection between the reservoir unit and an injection needle or cannula that infuses the drug the body, and each has a connector that is molded or fused to the respective adaptor plate for a mechanical and fluidic connection between the reservoir unit and the conveying unit at one end and the respective adapter (3a, 3b, 3c, 3d) at the other end. a) a first housing with a reservoir unit having an outlet into a fluid path for conducting the medication, which is downstream of said reservoir unit, b) a second housing with a conveying unit for the dosed dispensing of the medication from the reservoir unit and suitable means for controlling said conveying unit, c) an adapter (3a, 3c) with an adapter plate and with coupling means (5; 20, 23) for receiving the first housing with the reservoir unit and the second housing with the conveying unit, d) and attachment means in the form of a detachable adhesive bond or a skin patch so that the adapter (3a, 3c) can be carried extracorporeally on the patient by direct attachment to the surface of the patient's skin by placing the adapter plate of the adapter (3a, 3c) directly on the skin surface, c') a further adapter (3b, 3d) having an adapter plate and coupling means (5; 20, 23) for receiving the first housing with the reservoir unit and the second housing with the conveying unit, d') and attachment means (8, 21) in the form of connecting means (8, 21) to a carrying system for carrying the further adapter (3b, 3d) extracorporeally on the patient such that it is worn on an article of clothing with the adapter plate of the further adapter (3b, 3d) placed on the article of clothing, d") wherein the further adapter (3b, 3d), preferably the adapter plate (3b, 3d) of the further adapter, is connected to a disconnectable catheter head via a catheter line for the infusion of the medication, e) wherein the conveying unit and the reservoir unit can be combined into a complete mechanical and fluidic unit, preferably at least substantially without the use of tools, f) and can optionally be coupled with the adapter (3a, 3c) or the further adapter (3b, 3d) and decoupled from the adapter (3a, 3c) or the further adapter (3b, 3d) and thereby can optionally be combined with the adapter (3a, 3c) or the further adapter (3b, 3d) into a complete mechanical and fluidic unit, preferably at least substantially without the use of tools, h) wherein the adapter (3a, 3c) and the further adapter (3b, 3d) each establishes a fluid connection between the reservoir unit and an injection needle or cannula that infuses the drug the body, and each has a connector that is molded or fused to the respective adaptor plate for a mechanical and fluidic connection between the reservoir unit and the conveying unit at one end and the respective adapter (3a, 3b, 3c, 3d) at the other end.