Carmustine Products | Cleanchem - Carmustine is a chemotherapy drug used to treat various cancers, including brain tumors, multiple myeloma, and lymphomas. It is an alkylating agent that interferes with DNA replication, inhibiting cancer cell growth. Carmustine is often administered intravenously or as a wafer implanted directly into a tumor. Side effects can include bone marrow suppression, nausea, and pulmonary toxicity.