Carmustine is also known as BiCNU. In some instances, health care specialists can use the trade name BCNU or other ones like BiCNU when referring to the generic medication name carmustine. Carmustine is used to treat brain tumors (glioblastoma, medulloblastoma, brainstem glioma, astrocytoma, metastatic and ependymoma brain tumors), Hodgkin disease, cancer of the bone marrow, and non-Hodgkin lymphoma. It can be used alone or in combination with other drugs. It can also be used to treat other medical conditions determined by your doctor. Carmustine is an antineoplastic. It functions by obstructing the growth of cancerous cells.