Filgrastim
Zarxio is a biosimilar medication containing filgrastim-sndz, a white blood cell growth factor. It works by stimulating the bone marrow to produce more neutrophils, which are essential infection-fighting cells. This medication is primarily used to reduce the risk of infection in patients undergoing chemotherapy, those receiving bone marrow transplants, or individuals with severe chronic neutropenia.
Zarxio is an injectable biosimilar used to boost white blood cell production in patients at risk of infection from chemotherapy or other conditions.
Key facts at a glance
- RxNorm
- 1605067
- Generic
- Zarxio
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Zarxio is used to reduce the incidence of infection in patients with non-myeloid malignancies undergoing myelosuppressive chemotherapy, patients undergoing bone marrow transplantation, patients undergoing peripheral blood progenitor cell collection and therapy, and patients with congenital, cyclic, or idiopathic neutropenia.
Zarxio is a colony-stimulating factor that acts on hematopoietic cells by binding to specific cell surface receptors, stimulating the production, differentiation, and activation of neutrophils in the bone marrow.
Zarxio is administered as a subcutaneous injection. Common side effects may include bone pain, fever, and injection site reactions. It should not be used in patients with known hypersensitivity to filgrastim products. Regular blood monitoring may be required during treatment. Patients should inform their healthcare provider about any spleen problems, skin conditions, or latex allergies before treatment.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy