 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  a certain natural substance made by your body. It is used to help your body make more white blood cells. White blood cells are important to help you fight off infections. Pegfilgrastim is given to people whose ability to make white blood cells is reduced due to chemotherapy. Some brands may also be used to increase white blood cells after exposure to large amounts of radiation.This monograph is about the following pegfilgrastim products: pegfilgrastim, pegfilgrastim-apgf, pegfilgrastim-cbqv, pegfilgrastim-jmdb, pegfilgrastim-bmez, pegfilgrastim-fpgk, and pegfilgrastim-pbbk. How to use Udenyca Autoinjector 6 Mg/0.6 Ml Subcutaneous Auto-Injector Leukocyte Stimulating Factors Read the Patient Information Leaflet and Instructions for Use if available from your pharmacist before you start using pegfilgrastim and each time you get a refill. If you have any questions, ask your doctor or pharmacist. This medication is given by injection under the skin as directed by your doctor. For use during chemotherapy, it </s>