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BCMA×CD3 Bispecific Antibody

Elranatamab

Brand names: Elrexfio

Elranatamab is a bispecific T-cell engaging antibody used in the treatment of relapsed or refractory multiple myeloma.

Dosing — being independently re-sourced

ClinCalc Pro is rebuilding its dose data from primary open sources — the manufacturer SmPC (eMC), the WHO Model Formulary and other official references — under clinician review. This drug's structured dose is not yet published here. Confirm all doses against the product SmPC and your local formulary before prescribing.

Clinical monograph

How it works

It binds B-cell maturation antigen (BCMA) on myeloma cells and CD3 on T cells, bringing them together to trigger T-cell-mediated killing of the malignant plasma cells.

Prescribing in practice

  • Can cause cytokine release syndrome and neurological toxicity including immune effector cell-associated neurotoxicity, so step-up dosing and monitoring in an appropriately equipped setting are required.
  • It increases the risk of serious infections, so infection prophylaxis and prompt treatment of infections are important.
  • Treatment should be initiated and supervised by clinicians experienced in managing myeloma and the toxicities of T-cell engaging therapies.

Monitoring

Monitor closely for cytokine release syndrome, neurological symptoms, infections and blood counts during and after dosing.

Counselling the patient

  • Report fever, breathlessness, confusion or any new neurological symptoms to your team straight away.
  • Tell your team about any signs of infection promptly, as these can become serious.

Evidence & guidelines

Bispecific BCMA-directed antibodies are used in relapsed or refractory multiple myeloma in line with their licensed indications and NICE appraisals.

Reference: MagnetisMM-3 trial (Lesokhin et al. NEJM 2023); MHRA SPC Elrexfio 2023; NICE appraisal in progress; Bahlis et al. ASH 2022; Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.