Polycythemia vera and immune thrombocytopenic purpura clinics are two different hematologic diseases in aspect of etiology and treatment. Coexistence of both diseases may cause difficulties in treatment method. There is very few source relating to treatment method and coexistence of polycythemia vera and immune thrombocytopenic purpura in literature. We have presented two cases with polycythemia vera and immune thrombocytopenic purpura and our treatment method.