In animal studies, Erythropoietin Beta did not make cisplatin's harmful effect on the bone marrow any worse. The bone marrow is where your body makes blood cells. The same was true for other cancer medicines like etoposide, cyclophosphamide and fluorouracil.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.