A drug administration valve (100) comprises a valve housing (200) having a plurality of drug inlets (D1 to D4) for receiving drug fluids, such as cytostatic, one flushing inlet (F) for receiving a flushing fluid, and an outlet (O). A valve member (300) rotationally arranged in the housing has a passageway (320； 321) presenting a single inlet (322) and a single outlet (324).The valve member (300) presents a plurality of drug positions for guiding an associated drug fluid to the outlet (O), and one or more flushing positions for guiding a flushing fluid through the same passageway (320； 321) as the drug fluids in order to flush said passageway (320； 321) from any drug residuals. The valve member (300) is prevented from rotating from one drug position to another drug position without passing one of said flushing positions
