Elzonris, illustration of injection vial form (not a photo of the actual pack)

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Elzonris

Tagraxofusp

Prescription required

$19590.00

1mg/ml · 1 vial

BrandBranded medicine· By Stemline Therapeutics

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FDA boxed warningCapillary 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.

Capillary Leak Syndrome (CLS), which may be life-threatening or fatal if not properly managed, can occur in patients receiving ELZONRIS.

Read this with the rest of the clinical information

About Elzonris

Overview

Elzonris (tagraxofusp) is a prescription medicine given by intravenous infusion. It treats blastic plasmacytoid dendritic cell neoplasm (BPDCN) in adults and children aged 2 years and older. It targets cells with a protein called CD123 and stops them from making proteins, causing those cells to die.

What it treats

Blastic plasmacytoid dendritic cell neoplasm (BPDCN) in adults and children aged 2 years and older.

Safety information

Side effects

Common side effects include nausea, tiredness, fever, swelling in the limbs, weight gain and capillary leak syndrome. Common blood test changes include low albumin, platelets, hemoglobin, calcium and sodium, and increased blood sugar and liver enzymes (ALT and AST). Serious side effects include capillary leak syndrome, allergic reactions and liver toxicity. Contact your doctor promptly if you experience a serious reaction. Your healthcare team will monitor for allergic reactions and check your liver enzymes during treatment.

FDA 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.

Capillary Leak Syndrome (CLS), which may be life-threatening or fatal if not properly managed, can occur in patients receiving ELZONRIS.

A boxed warning is the strongest warning the US Food and Drug Administration requires on a medicine label. Text is taken from the official label, with internal section references removed.

When to call your doctor

• Seek medical attention immediately if you develop swelling in your hands or feet or weight gain. Elzonris can cause capillary leak syndrome, which may be life-threatening or fatal.

If symptoms are severe or getting worse quickly, seek emergency care rather than waiting.

Before taking this medicine

The label lists no contraindications for Elzonris. Patients should be monitored for signs of hypersensitivity reactions and treated appropriately if these occur. Elzonris can cause liver toxicity. Liver enzymes ALT and AST should be monitored, and treatment interrupted if they rise to more than 5 times the upper limit of normal. Women should not breastfeed while receiving Elzonris.

Using Elzonris

Dosing

Dosing is set by your prescriber. Each health care professional may prescribe medication differently according to a patient's medical history and condition, so follow the directions on your prescription label and speak to your doctor or pharmacist before changing anything.

Storage

Store in the original carton below 25°C, protected from light, unless the pack states refrigeration. Do not freeze. Keep all medicines out of the sight and reach of children.

Clinical information on this page is summarised from the US FDA label ELZONRIS (TAGRAXOFUSP) INJECTION, SOLUTION [STEMLINE THERAPEUTICS, INC.] (DailyMed, retrieved 19 September 2026).

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