DOSING & ADMINISTRATION
Starting with Reblozyl
Reblozyl should be initiated and monitored under the supervision of a physician experienced in the treatment of hematological diseases.1
START1:
- Hemoglobin (Hb) should be assessed prior to each Reblozyl administration. In case of a red blood cell (RBC) transfusion occurring prior to dosing, the pre‑transfusion Hb level must be considered for dosing purposes
- After reconstitution, Reblozyl solution should be injected subcutaneously (into the upper arm, thigh, or abdomen) every 3 weeks
- The recommended maximum volume of Reblozyl per injection
site is 1.2 mL. With reconstituted volumes larger than 1.2 mL, divide doses and administer across separate injection sites
- The recommended maximum volume of Reblozyl per injection
- If a scheduled injection is delayed or missed, administer Reblozyl as soon as possible and continue dosing as prescribed with at least 3 weeks between doses
- No starting dose adjustments are required in:
- Elderly patients
- Patients with hepatic impairment who have a total bilirubin >upper limit of normal (ULN) and/or alanine aminotransferase or aspartate aminotransferase <3x ULN
- Patients with mild to moderate renal impairment (estimated glomerular filtration rate [eGFR] <90 and ≥30 mL/min/1.73 m2)
MONITOR1:
- If Hb is ≥11.5 g/dL in the absence of transfusion for at least 3 weeks, delay dosing until the Hb is ≤11 g/dL. If there is also a concomitant rapid increase in Hb (>2 g/dL within 3 weeks in absence of transfusion), a dose reduction to one step down (minimum 0.8 mg/kg) should be considered after the dose delay
- In case of Hb increase >2 g/dL within 3 weeks of luspatercept treatment in absence of transfusion, the Reblozyl dose should be reduced by one dose level. Dose should not be reduced below 0.8 mg/kg
- If treatment-related Grade 3 or higher adverse reactions occur persistently, delay treatment until toxicity has improved or returned to baseline. After a dose delay, re-start patient at previous dose or at a reduced dose as per dose reduction guidance
- If there is a loss of response to Reblozyl, assess causative factors (eg, a bleeding event). If typical causes for a loss of hematological response are excluded, consider a dose increase
INDIVIDUALIZE1:
- Dosing with Reblozyl is customized by patient response. Dosing modifications may be needed to balance efficacy and safety
Start1
- The recommended starting dose is 1.0 mg/kg administered subcutaneously every 3 weeks
- Assess hemoglobin (Hb) prior to each Reblozyl administration
Monitor1
- Monitor Hb and for adverse drug reactions, in the event a dose delay is needed or there is a loss of response
Individualize1
- Dosing is customized by patient response; dosing modifications may be needed
Dosing modifications may be needed to
balance efficacy and safety1
Starting with Reblozyl
Reblozyl should be initiated and monitored under the supervision of a physician experienced in the treatment of hematological diseases.1

Start1
- Hemoglobin (Hb) should be assessed prior to each Reblozyl administration. In case of a red blood cell (RBC) transfusion occurring prior to dosing, the pre‑transfusion Hb level must be considered for dosing purposes.
- After reconstitution, Reblozyl solution should be injected subcutaneously (into the upper arm, thigh, or abdomen) every 3 weeks.
- The recommended maximum volume of Reblozyl per injection site is 1.2 mL. With reconstituted volumes larger than 1.2 mL, divide doses and administer across separate injection sites
- If a scheduled injection is delayed or missed, administer Reblozyl as soon as possible and continue dosing as prescribed with at least 3 weeks between doses
- No starting dose adjustments are required in:
- Elderly patients
- Patients with hepatic impairment who have a total bilirubin >upper limit of normal (ULN) and/or alanine aminotransferase or aspartate aminotransferase <3x ULN
- Patients with mild to moderate renal impairment (estimated glomerular filtration rate [eGFR] <90 and ≥30 mL/min/1.73 m2)

Monitor1
- If Hb is ≥11.5 g/dL in the absence of transfusion for at least 3 weeks, delay dosing until the Hb is ≤11 g/dL. If there is also a concomitant rapid increase in Hb (>2 g/dL within 3 weeks in absence of transfusion), a dose reduction to one step down (minimum 0.8 mg/kg) should be considered after the dose delay
- In case of Hb increase >2 g/dL within 3 weeks of luspatercept treatment in absence of transfusion, the Reblozyl dose should be reduced by one dose level. Dose should not be reduced below 0.8 mg/kg
- If treatment-related Grade 3 or higher adverse reactions occur persistently, delay treatment until toxicity has improved or returned to baseline. After a dose delay, re-start patient at previous dose or at a reduced dose as per dose reduction guidance
- If there is a loss of response to Reblozyl, assess causative factors (eg, a bleeding event). If typical causes for a loss of hematological response are excluded, consider a dose increase

Individualize1
- Dosing with Reblozyl is customized by patient response. Dosing modifications may be needed to balance efficacy and safety
Dosing Modifications
Dosing with Reblozyl is customized by patient response. The recommended starting dose of Reblozyl is 1.0 mg/kg once every 3 weeks.1
INCREASE DOSE1:
- Consider a dose increase in patients who have not achieved a reduction in RBC transfusion burden after at least 2 consecutive doses at the prior dose
- In patients who do not achieve a response, defined as a reduction in RBC transfusion burden of at least a third after ≥ 2 consecutive doses (6 weeks), at the 1.0 mg/kg starting dose, the dose should be increased to 1.25 mg/kg
- The dose should not be increased beyond the maximum dose of 1.25 mg/kg every 3 weeks
- If patients experience a loss of response to Reblozyl, causative factors (eg, a bleeding event) should be assessed. If typical causes for a loss of hematological response are excluded, dose increase should be considered as described above for the respective indication being treated
REDUCE DOSE1:
- In case of Hb increase ≥2 g/dL within 3 weeks, in absence of transfusions, reduce Reblozyl dose by one dose level1
- If the Hb is ≥11.5 g/dL in the absence of transfusion for at least 3 weeks, the dose should be delayed until the Hb is ≤11.0 g/dL
- If there is also a concomitant rapid increase in Hb (> 2 g/dL within 3 weeks in absence of transfusion), a dose reduction to one step down (minimum 0.8 mg/kg) should be considered after the dose delay
- Dose should not be reduced below 0.8 mg/kg
DISCONTINUE1:
- Reblozyl should be discontinued if patients do not experience a reduction in transfusion burden after 9 weeks of treatment (3 doses) at the maximum dose level if no alternative explanations for response failure are found (e.g. bleeding, surgery, other concomitant illnesses) or if unacceptable toxicity occurs at any time
Reblozyl offers stepwise dose increases to achieve
individual patient response1

INCREASE DOSE1

Reduce DOSE1
| Dose reductions for β-thalassemia1 | |
|---|---|
| CURRENT DOSE | DOSE REDUCTION |
| 1.25 mg/kg | 1 mg/kg |
| 1 mg/kg | 0.8 mg/kg |
Dose should not be reduced below 0.8 mg/kg.
Discontinue1
Reblozyl should be discontinued
if patients do not experience a reduction in transfusion burden after 9 weeks of treatment (3 doses) at the maximum dose level1
Dosing Modifications
Dosing with Reblozyl is customized by patient response. The recommended starting dose of Reblozyl is 1.0 mg/kg once every 3 weeks.1
Reblozyl offers stepwise dose increases to achieve
individual patient response1

The dose should not be increased beyond the maximum of 1.25 mg/kg every 3 weeks.1

INCREASE DOSE1:
- Consider a dose increase in patients who have not achieved a reduction in RBC transfusion burden after at least 2 consecutive administrations (6 weeks) at the prior dose
- In patients who do not achieve a response, defined as a reduction in RBC transfusion burden of at least a third after ≥ 2 consecutive doses (6 weeks), at the 1.0 mg/kg starting dose, the dose should be increased to 1.25 mg/kg
- The dose should not be increased beyond the maximum dose of 1.25 mg/kg every 3 weeks
- If patients experience a loss of response to Reblozyl, causative factors (e.g. a bleeding event) should be assessed. If typical causes for a loss of hematological response are excluded, dose increase should be considered as described above for the respective indication being treated

REDUCE DOSE1:
- In case of Hgb increase ≥2 g/dL within 3 weeks, in absence of transfusions, reduce Reblozyl dose by one dose level1
- If the Hb is ≥11.5 g/dL in the absence of transfusion for at least 3 weeks, the dose should be delayed until the Hb is ≤11.0 g/dL
- If there is also a concomitant rapid increase in Hb (> 2 g/dL within 3 weeks in absence of transfusion), a dose reduction to one step down (minimum 0.8 mg/kg) should be considered after the dose delay
- Dose should not be reduced below 0.8 mg/kg

DISCONTINUE1:
- Reblozyl should be discontinued if patients do not experience a reduction in transfusion burden after 9 weeks of treatment (3 doses) at the maximum dose level if no alternative explanations for response failure are found (e.g. bleeding, surgery, other concomitant illnesses) or if unacceptable toxicity occurs at any time
| DOSE REDUCTIONS FOR β-THALASSEMIA |
|
|---|---|
| CURRENT DOSE | DOSE REDUCTION |
| 1.25 mg/kg | 1 mg/kg |
| 1 mg/kg | 0.8 mg/kg |
Preparation &
administration
Reconstitution1
Reblozyl must be reconstituted gently prior to administration. Aggressive shaking should be avoided.
The appropriate number of Reblozyl vials should be reconstituted to achieve the desired dose. A syringe with appropriate graduations must be used for reconstitution to ensure accurate dosage.
After reconstitution, each mL of solution contains 50 mg of Reblozyl. Any unused medicinal product or waste material should be disposed of in accordance with local requirements.1
Download the Dosing & Reconstitution Guide. This guide includes all the information found here, as well as the full steps for reconstitution of Reblozyl, plus storage information.
Sample calculation for subcutaneous administration of Reblozyl1
- Average adult male 30 years of age and weighing 89 kg
- 1 mg of Reblozyl per 1 kg = 89 starting dose
Reblozyl is available in 2 strengths as single-dose vials for reconstitution1
Reblozyl is supplied as a lyophilized powder for reconstitution before use.
| Water for injections (WFI) should be used when reconstituting Reblozyl1: | |
|---|---|
| 25 mg vial | After reconstitution with 0.68 mL WFI, each 25 mg single-dose vial will deliver at least 0.5 mL of 50 mg/mL Reblozyl |
| 75 mg vial | After reconstitution with 1.6 mL WFI, each 75 mg single-dose vial will deliver at least 1.5 mL of 50 mg/mL Reblozyl |
Sample calculation for subcutaneous administration of Reblozyl1
| TOTAL VOLUME OF RECONSTITUTED 50 MG/ML SOLUTION NEEDED TO ADMINISTER 89 MG: 1.78 ML (Average adult male 30 years old and weighing 89 kg) |
||||
|---|---|---|---|---|
| NUMBER OF VIALS |
REBLOZYL | CONCENTRATION AFTER RECONSTITUTION |
VOLUME OF RECONSTITUTED SOLUTION FOR ADMINISTRATION | MG IN SOLUTION |
| 1 | 75 mg vial | 75 mg/1.5 mL (50 mg/mL) | Use 1.5 mL | 75 mg |
| 1 | 25 mg vial | 25 mg/0.5 mL (50 mg/mL) | Use 0.28 mL | 14 mg |
| Total volume needed 1.78 mL |
89 mg | |||
Dividing doses and administering with reconstituted volumes larger than 1.2 mL:
Injection 1: 0.89 mL – in upper arm Injection 2: 0.89 mL – in thigh or abdomen
Administering Reblozyl1
- Prior to administration, allow solution to reach room temperature for a more comfortable injection
Reblozyl is administered subcutaneously every 3 weeks1
| STEP 1 | ||
| Verify correct dose for the patient1 |
Calculate the exact total dosing volume required for the patient (See sample calculation chart above) |
|
| STEP 2 | ||
| Plan and prep for injection1 |
Slowly withdraw the dosing volume of the reconstituted Reblozyl solution from the single-dose vial(s) into a syringe. The recommended maximum volume of medicinal product per injection site is 1.2 mL. Divide doses requiring larger reconstituted volumes into separate similar volume injections and administer across separate sites. If multiple injections are required, use a new syringe and needle for each subcutaneous injection. |
|
| STEP 3 | ||
| Administer subcutaneously1 |
Prior to injection, allow solution to reach room temperature for a more comfortable injection. Administer the SC injection(s) into the upper arm, thigh, and/or abdomen. |
![]() |
Do not administer more than 1 dose from a vial
Do not mix with other medications
Do not pool unused portions from the vials
Discard any unused portion
Preparation & Administration
Reblozyl is available in 2 strengths as single-dose vials for reconstitution1
Reblozyl is supplied as a lyophilized powder for reconstitution before use
| Water for injections (WFI) should be used when reconstituting Reblozyl1: | |
|---|---|
| 25 mg vial | After reconstitution with 0.68 mL WFI, each 25 mg single-dose vial will deliver at least 0.5 mL of 50 mg/mL Reblozyl |
| 75 mg vial | After reconstitution with 1.6 mL WFI, each 75 mg single-dose vial will deliver at least 1.5 mL of 50 mg/mL Reblozyl |
Reblozyl must be reconstituted gently prior to administration. Aggressive shaking should be avoided.
The appropriate number of Reblozyl vials should be reconstituted to achieve the desired dose. A syringe with appropriate graduations must be used for reconstitution to ensure accurate dosage.
Download the Dosing & Reconstitution Guide. This guide includes all the information found here, as well as the full steps for reconstitution of Reblozyl, plus storage information.
After reconstitution, each mL of solution contains 50 mg of Reblozyl. Any unused medicinal product or waste material should be disposed of in accordance with local requirements.1
Sample calculation for subcutaneous administration of Reblozyl1
- Average adult male 30 years of age and weighing 89 kg
- 1 mg of Reblozyl per 1 kg = 89 starting dose
| TOTAL VOLUME OF RECONSTITUTED SOLUTION NEEDED TO ADMINISTER 89 MG: 1.78 ML1 | ||
|---|---|---|
| # OF VIALS | 1 | 1 |
| REBLOZYL | 75 mg vial |
25 mg vial |
| CONCENTRATION AFTER RECONSTITUTION |
75 mg/1.5 mL (50 mg/mL) |
25 mg/0.5 mL (50 mg/mL) |
| VOLUME OF RECONSTITUTED SOLUTION FOR ADMINISTRATION | Use 1.5 mL | Use 0.28 mL |
| MG IN SOLUTION |
75 mg | 14 mg |
| Total volume needed 1.78 mL | 89 mg | |
Dividing doses and administering with reconstituted volumes larger than 1.2 mL:
- Injection 1: 0.89 mL –in upper arm
- Injection 2: 0.89 mL –in thigh or abdomen
Administering Reblozyl
Reblozyl is conveniently administered subcutaneously every 3 weeks
- Prior to administration, allow solution to reach room temperature for a more comfortable injection
| STEP 1 |
|
Verify correct dose for the patient1 Calculate the exact total dosing volume required for the patient |
| STEP 2 |
|
Plan and prep for injection1 Slowly withdraw the dosing volume of the reconstituted Reblozyl solution from the single-dose vial(s) into a syringe Divide doses requiring larger reconstituted volumes (ie, >1.2 mL) into separate similar volume injections and administer across separate sites |
| STEP 3 |
|
Administer subcutaneously1 If multiple injections are required, use a new syringe and needle for each SC injection Administer the SC injection into the upper arm, thigh, and/or abdomen |
Do not administer more than 1 dose from a vial
Do not mix with other medications
Do not pool unused portions from the vials
Discard any unused portion

