Peg-L-Asparaginase is an enzyme used in treating acute lymphoblastic leukemia (ALL) and other lymphoid malignancies. It works by breaking down the amino acid asparagine, which is crucial for the growth and survival of leukemia cells.

By depriving the cancer cells of this essential nutrient, the medication helps to slow down or stop their growth. Peg-L-Asparaginase is a longer-acting form of the medication L-Asparaginase and is given as an injection under the skin or into a vein.

However, it might cause side effects like nausea, vomiting, fever, and liver problems.