ABOUT REBLOZYL:
MOA

REBLOZYL works to restore balance in erythropoiesis1,2

In steady-state erythropoiesis, proliferation and maturation are balanced, and sufficient functional RBCs are produced. Refer to reference 3 for details.
In MDS, erythropoiesis is imbalanced. In the proliferation phase, excess and dysfunctional erythroid precursors accumulate. In the maturation phase, there is insufficient maturation. These changes result in a decreased quantity of functional RBCs. Refer to reference 4 and the asterisk footnote for details.
With REBLOZYL, balance is restored. In the proliferation phase, there is steady production of functional erythroid precursors. In the maturation phase, maturation is restored. These changes increase the quantity and quality of mature, functional RBCs. Refer to references 2, 5, and 6 and to the asterisk footnote for details.

REBLOZYL works differently than ESAs to enhance erythroid maturation—ESAs drive proliferation, whereas REBLOZYL promotes erythroid maturation.1,2,5-8

REBLOZYL restores erythropoiesis by increasing the number and improving the quality of mature RBCs as observed in preclinical studies2,5

In preclinical models, REBLOZYL improved2,5:

  • Hgb levels
  • RBC morphology
  • Other hematology parameters† associated with ineffective erythropoiesis

*REBLOZYL binds several TGF-β superfamily ligands, thereby diminishing Smad2/3 signaling and increasing the number of mature RBCs.2,5
†Other hematology parameters include reducing oxidative stress in erythrocytes, reducing accumulation of α-globin aggregates in erythrocyte membranes, and improving RBC lifespan.5

ESA=erythropoiesis-stimulating agent; Hgb=hemoglobin; MDS=myelodysplastic syndromes; MOA=mechanism of action; RBC=red blood cell; TGF-beta=transforming growth factor beta.

Doctor speaking to patient with LR-MDS anemia about REBLOZYL

See which types of patients may 
benefit from REBLOZYL

References: 1. REBLOZYL [US Prescribing Information]. Summit, NJ: Celgene Corporation; 2026. 2. Attie KM, Allison MJ, Mclure T, et al. A phase 1 study of ACE-536, a regulator of erythroid differentiation, in healthy volunteers. Am J Hematol. 2014;89(7):766-700. 3. Oikonomidou PR, Rivella S. What can we learn from ineffective erythropoiesis in thalassemia? Blood Rev. 2018;23(2):130-143. doi:10.1016/j.blre.2017.10/001 4. Gupta R, Musallam KM, Taher AT, Rivella S. Ineffective erythropoiesis: anemia and iron overload. Hematol Oncol Clin North Am. 2018;32(2):213-221. doi:10.1016/j.hoc.2017.11.009 5. Suragani RNVS, Cawley SM, Li R, et al. Modified activin receptor IIB ligand trap mitigates ineffective erythropoiesis and disease complications in murine β-thalassemia. Blood. 2014;123(25):3864-3872. 6. Hayati S, Platzbecker U, Aluri S, et al. Luspatercept improves hematopoiesis in lower-risk myelodysplastic syndromes: comparative biomarker analysis of ring sideroblast-positive and -negative subgroups from the phase 3 COMMANDS study. Presented at: European Hematology Association (EHA) Hybrid Congress. June 13-16, 2024, Madrid, Spain. 7. Elliott S, Phama E, Macdougall IC. Erythropoietins: A common mechanism of action. Exp Hematol. 2008;36:1573-1584. 8. Elliot S, Sinclair AM. The effect of erythropoietin on normal and neoplastic cells. Biologics. 2012;6:163-189.

References

INDICATIONS

REBLOZYL® (luspatercept-aamt) is indicated for the treatment of anemia in adult patients with beta thalassemia who require regular red blood cell (RBC) transfusions.

REBLOZYL® (luspatercept-aamt) is indicated for the treatment of anemia without previous erythropoiesis stimulating agent use (ESA-naïve) in adult patients with very low- to intermediate-risk myelodysplastic syndromes (MDS) who may require regular red blood cell (RBC) transfusions.

REBLOZYL® (luspatercept-aamt) is indicated for the treatment of anemia failing an erythropoiesis stimulating agent and requiring 2 or more red blood cell (RBC) units over 8 weeks in adult patients with very low- to intermediate-risk myelodysplastic syndromes with ring sideroblasts (MDS-RS) or with myelodysplastic/myeloproliferative neoplasm with ring sideroblasts and thrombocytosis (MDS/MPN-RS-T).

REBLOZYL is not indicated for use as a substitute for RBC transfusions in patients who require immediate correction of anemia.

IMPORTANT SAFETY INFORMATION

WARNINGS AND PRECAUTIONS

Thrombosis/Thromboembolism

In adult patients with beta thalassemia, thromboembolic events (TEE) were reported in 8/223 (3.6%) of REBLOZYL-treated patients. TEEs included deep vein thrombosis, pulmonary embolus, portal vein thrombosis, and ischemic stroke. Patients with known risk factors for thromboembolism (splenectomy or concomitant use of hormone replacement therapy) may be at further increased risk of thromboembolic conditions. Consider thromboprophylaxis in patients at increased risk of TEE. Monitor patients for signs and symptoms of thromboembolic events and institute treatment promptly.

Hypertension

Hypertension was reported in 11.4% (63/554) of REBLOZYL-treated patients. Across clinical studies, the incidence of Grade 3 to 4 hypertension ranged from 2% to 9.6%. In patients with beta thalassemia with normal baseline blood pressure, 13 (6.2%) patients developed systolic blood pressure (SBP) ≥130 mm Hg and 33 (16.6%) patients developed diastolic blood pressure (DBP) ≥80 mm Hg. In ESA-refractory or -intolerant adult patients with MDS with normal baseline blood pressure, 26 (30%) patients developed SBP ≥130 mm Hg and 23 (16%) patients developed DBP ≥80 mm Hg. In ESA-naïve adult patients with MDS with normal baseline blood pressure, 23 (36%) patients developed SBP ≥140 mm Hg and 11 (6%) patients developed DBP ≥80 mm Hg. Monitor blood pressure prior to each administration. Manage new or exacerbations of preexisting hypertension using anti-hypertensive agents.

Extramedullary Hematopoietic (EMH) Masses

In adult patients with transfusion-dependent beta thalassemia, EMH masses were observed in 3.2% of REBLOZYL-treated patients, with spinal cord compression symptoms due to EMH masses occurring in 1.9% of patients (BELIEVE and REBLOZYL long-term follow-up study).

In a study of adult patients with non-transfusion-dependent beta thalassemia, a higher incidence of EMH masses was observed in 6.3% of REBLOZYL-treated patients vs. 2% of placebo-treated patients in the double-blind phase of the study, with spinal cord compression due to EMH masses occurring in 1 patient with a prior history of EMH. REBLOZYL is not indicated for use in patients with non-transfusion-dependent beta thalassemia.

Possible risk factors for the development of EMH masses in patients with beta thalassemia include history of EMH masses, splenectomy, splenomegaly, hepatomegaly, or low baseline hemoglobin (<8.5 g/dL). Signs and symptoms may vary depending on the anatomical location. Monitor patients with beta thalassemia at initiation and during treatment for symptoms and signs or complications resulting from the EMH masses and treat according to clinical guidelines. Discontinue treatment with REBLOZYL in case of serious complications due to EMH masses. Avoid use of REBLOZYL in patients requiring treatment to control the growth of EMH masses.

Embryo-Fetal Toxicity

REBLOZYL may cause fetal harm when administered to a pregnant woman. REBLOZYL caused increased post-implantation loss, decreased litter size, and an increased incidence of skeletal variations in pregnant rat and rabbit studies. Advise pregnant women of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during treatment and for at least 3 months after the final dose.

ADVERSE REACTIONS

Beta-Thalassemia

Serious adverse reactions occurred in 3.6% of patients on REBLOZYL. Serious adverse reactions occurring in 1% of patients included cerebrovascular accident and deep vein thrombosis. A fatal adverse reaction occurred in 1 patient treated with REBLOZYL who died due to an unconfirmed case of acute myeloid leukemia (AML).

Most common adverse reactions (at least 10% for REBLOZYL and 1% more than placebo) were headache (26% vs 24%), bone pain (20% vs 8%), arthralgia (19% vs 12%), fatigue (14% vs 13%), cough (14% vs 11%), abdominal pain (14% vs 12%), diarrhea (12% vs 10%) and dizziness (11% vs 5%).

ESA-naïve adult patients with Myelodysplastic Syndromes

Grade >3 (>2%) adverse reactions included hypertension and dyspnea.

The most common (>10%) all-grade adverse reactions included diarrhea, fatigue, hypertension, peripheral edema, nausea, and dyspnea.

ESA-refractory or -intolerant adult patients with Myelodysplastic Syndromes

Grade ≥3 (≥2%) adverse reactions included fatigue, hypertension, syncope and musculoskeletal pain. A fatal adverse reaction occurred in 5 (2.1%) patients.

The most common (≥10%) adverse reactions included fatigue, musculoskeletal pain, dizziness, diarrhea, nausea, hypersensitivity reactions, hypertension, headache, upper respiratory tract infection, bronchitis, and urinary tract infection.

LACTATION

It is not known whether REBLOZYL is excreted into human milk or absorbed systemically after ingestion by a nursing infant. REBLOZYL was detected in milk of lactating rats. When a drug is present in animal milk, it is likely that the drug will be present in human milk. Because many drugs are excreted in human milk, and because of the unknown effects of REBLOZYL in infants, a decision should be made whether to discontinue nursing or to discontinue treatment. Because of the potential for serious adverse reactions in the breastfed child, breastfeeding is not recommended during treatment and for 3 months after the last dose.

DRUG ABUSE POTENTIAL

Abuse: Abuse of REBLOZYL may be seen in athletes for the effects on erythropoiesis. Misuse of drugs that increase erythropoiesis, such as REBLOZYL, by healthy persons may lead to polycythemia, which may be associated with life-threatening cardiovascular complications.

For more information, please see US Full Prescribing Information for REBLOZYL.

Bristol Myers Squibb® logo

Important Safety Information | Full Prescribing Information | Contact Us | Legal Notice | Privacy Policy | Your Privacy Choices |  Sitemap

REBLOZYL® is a trademark of Celgene Corporation, a Bristol Myers Squibb company.
Access Support® is a trademark of Bristol-Myers Squibb Company.
REBLOZYL® is licensed from Merck & Co. Inc., Rahway, NJ, USA and its affiliates.

© 2026 Bristol-Myers Squibb Company.   
2007-US-2600044  05/26