TheraRadar
Data updated: Mar 29, 2026

ELZONRIS

TAGRAXOFUSP-ERZS CD123 Interactions
Oncology Approved 2018-12-21

ELZONRIS (tagraxofusp-erzs) is a CD123-directed cytotoxin indicated for the treatment of blastic plasmacytoid dendritic cell neoplasm (BPDCN). This therapy is approved for use in both adult patients and pediatric patients aged 2 years and older. It serves as a targeted treatment option for patients diagnosed with this specific hematologic malignancy.

Source: FDA Label • STEMLINE THERAPEUTICS INC • CD123 Interaction

How ELZONRIS Works

Tagraxofusp-erzs is a fusion protein composed of recombinant human interleukin-3 (IL-3) and a truncated diphtheria toxin. The IL-3 component of the drug specifically targets and binds to the CD123 receptor on the surface of cells. Once the drug is internalized, it inhibits protein synthesis, which leads to cell death in CD123-expressing cells.

2
Indications
--
Phase 3 Trials
1
Priority Reviews
7
Years on Market

Details

Status
Prescription
First Approved
2018-12-21
Routes
INJECTION
Dosage Forms
SOLUTION

Companies

Active Ingredient: TAGRAXOFUSP-ERZS

ELZONRIS Approval History

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What ELZONRIS Treats

1 indications

ELZONRIS is approved for 1 conditions since its original approval in 2018. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Blastic Plasmacytoid Dendritic Cell Neoplasm
Source: FDA Label

ELZONRIS Boxed Warning

CAPILLARY LEAK SYNDROME Capillary Leak Syndrome (CLS) which may be life-threatening or fatal, can occur in patients receiving ELZONRIS. Monitor for signs and symptoms of CLS and take actions as recommended [see Warnings and Precautions ( 5.1 )] . WARNING: CAPILLARY LEAK SYNDROME See full prescribing information for complete boxed warning. Capillary Leak Syndrome (CLS), which may be life-threatening or fatal if not properly managed, can occur in patients receiving ELZONRIS. ( 5.1 )...

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Key Completed Trials

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Completed studies with published results, ranked by significance

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

ELZONRIS FDA Label Details

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Indications & Usage

FDA Label (PDF)

ELZONRIS is indicated for the treatment of blastic plasmacytoid dendritic cell neoplasm (BPDCN) in adults and in pediatric patients 2 years and older. ELZONRIS is a CD123-directed cytotoxin indicated for the treatment of blastic plasmacytoid dendritic cell neoplasm (BPDCN) in adults and in pediatric patients 2 years and older

⚠️ BOXED WARNING

WARNING: CAPILLARY LEAK SYNDROME Capillary Leak Syndrome (CLS) which may be life-threatening or fatal, can occur in patients receiving ELZONRIS. Monitor for signs and symptoms of CLS and take actions as recommended [see Warnings and Precautions ( 5.1 )] . WARNING: CAPILLARY LEAK SYNDROME See full pr...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.