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
