Efbemalenograstim alfa-vuxw: uses, dosing, side effects
Last updated September 7, 2026.
**Efbemalenograstim alfa-vuxw injection (Ryzneuta) is a granulocyte colony-stimulating factor that helps prevent infections during chemotherapy.** It helps your bone marrow make neutrophils, white blood cells that fight infection. You can still develop infections, so call your oncology team immediately for fever or chills.
What does it treat?
You may receive it if you are an adult with a nonmyeloid cancer, such as breast cancer, receiving chemotherapy likely to cause febrile neutropenia. This means fever with very low neutrophil counts. It reduces this complication rather than treating the cancer itself.
How do you take it?
A healthcare professional injects 20 mg under your skin once per chemotherapy cycle, using a 20 mg/1 mL prefilled syringe. Give it at least 24 hours after chemotherapy and outside the 14 days before the next chemotherapy dose. There is no daily dosing schedule or separate daily ceiling. You can eat normally. Call your oncology team immediately about a missed appointment; do not double doses. Get help before another dose for allergic symptoms, breathing problems, or left upper abdominal pain.
Side effects to know
- Common: You may experience nausea, fatigue, bone pain, anemia, or low platelets.
- Serious: Stop further doses and get immediate help for possible anaphylaxis, spleen rupture, serious lung injury, or a sickle cell crisis. Bloody urine, reduced urination, swelling, unusual bleeding, or fever with abdominal or back pain also need urgent evaluation for kidney injury, capillary leak, platelet problems, or aortic inflammation.
Who should not take it?
Do not receive it after a serious allergy to this medicine, filgrastim, or pegfilgrastim products. Tell your clinician about latex allergy, sickle cell disease, kidney problems, and low blood counts. Review all medicines and chemotherapy dates. Pregnancy risks and effects on breast milk or a nursing infant are unknown. The label gives no specific alcohol restriction; check your chemotherapy plan with your oncology team.
When is it an emergency?
For overdose, call Poison Control at 1-800-222-1222 immediately; bone pain and excessive white blood cells can occur. Call 911 for collapse or breathing trouble, including facial swelling or wheezing from anaphylaxis. Seek emergency care for severe left upper abdominal or shoulder pain, or rapid swelling with faintness.
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Common questions
What is the maximum dose?
The labeled adult dose is 20 mg once per chemotherapy cycle. It is not a daily medicine. Extra doses require immediate contact with your oncology team.
Can I drink alcohol?
The label does not specify an alcohol limit. Your chemotherapy and other medicines may require avoiding alcohol. Ask your oncology team before drinking.
Can I receive it while pregnant or breastfeeding?
Tell your clinician before treatment. Pregnancy data are insufficient to establish risk. Its presence in breast milk and effects on a nursing infant are unknown. Your team must assess your entire treatment plan.
Do I need food before the injection?
You do not need to time it around meals. Continue your usual diet unless instructed otherwise. Tell your team if nausea prevents eating or drinking.
What are overdose signs?
Bone pain can occur. High white blood cell counts require blood testing to detect. Call Poison Control at 1-800-222-1222 without waiting for symptoms; call 911 for collapse or breathing trouble.
What interactions matter?
Chemotherapy timing is essential. Share all medicines and supplements with your oncology team. Tell your imaging team before a bone scan because treatment can affect results.