CytarabineYour haematologist can advise if this drug is suitable for you. Low-dose cytarabine is sometimes prescribed to treat myelofibrosis (MF). It is given by injection twice a day or sometimes by infusion. Sometimes this drug needs to be given in hospital. This drug interferes with the production of cells in the bone marrow. Your haematologist may suggest this medication if your disease is progressing quickly or if your spleen is very large and causing discomfort. The drug is given over short periods of time. Your haematologist will monitor your progress carefully while you take this drug. This drug is not suitable for if you are pregnant, planning to become pregnant or planning to father a child.