New treatment regimens with increased efficiency and reduced toxicities are being introduced in the treatment of Multiple Myeloma (MM). As a result, patients can expect increased survival, but also increased time on active treatment. Consequently, patients spend an increasing amount of time at the hospital and on transportation. This may not only expose the patients to unnecessary risks of infections, but will also reduce their available time to have a meaningful life. Carfilzomib is a drug used alone or in combination with other drugs for treatment of relapsed multiple myeloma. It is gives as an intravenous infusion day 1 and 2, day 8 and 9, and day 15 and 16 every 28th day. Thus, the patients have to show up at the hospital many times with the risk of acquiring infections. Likewise they sometimes live a long way from the hospital, and therefore spent a lot of time on transportation to and from treatment. The investigator wish to minimize the number of times the patients have to go to the hospital, by educating them to self-administer day 2, 9 and 16 in their own home. The investigator hope thereby to reduce their risk of hospital-acquired infections and to reduce the time spent on transportation to and from treatment. From a hospital point of view the investigator hope it will reduce the pressure on space in the outpatient clinic; that it will reduce the time a nurse spent on treatment. In the present project, intravenous Carfilzomib is administered in the hospital through a peripheral intravenous needle on day 1, 8, and 15 of a 28-day cycle and the treatment for the day after is handed to the patient in a cooling compartment. The next day the patient will load the Carfilzomib into the pump and attach it to the peripheral intravenous needle. Once the infusion if finished, the patient will remove the needle and the following week, bring the cooling compartment and the pump back to the hospital.