Hematopoietic stem cell mobilizers are used to help people with non-Hodgkin lymphoma or multiple myeloma prepare for stem cell transplants. These medications work by encouraging your bone marrow to release more stem cells into your bloodstream, which can then be collected and used for transplantation. Hematopoietic stem cell mobilizers are typically available as injections. One example is Aphexda (motixafortide).