Carfilzomib Products | Cleanchem - Carfilzomib is a proteasome inhibitor used in the treatment of multiple myeloma, particularly in patients who have relapsed or are refractory to other treatments. It works by inhibiting proteasomes, leading to the accumulation of damaged proteins and ultimately inducing cancer cell death. Carfilzomib is administered intravenously and often used in combination with other chemotherapy drugs. Side effects include fatigue, anemia, and peripheral neuropathy.