When does neulasta start to work?

Neulasta (pegfilgrastim) typically starts to work within 24 to 48 hours after administration. Its primary function is to stimulate the production of white blood cells, specifically neutrophils, to help reduce the risk of infection in patients undergoing chemotherapy. The peak effect usually occurs around 5 to 7 days after the injection. However, individual responses may vary based on the patient's condition and treatment regimen.