Humalog Mix 50IU 3ml Penfill (5-pack) is a premixed insulin containing 50% insulin lispro (rapid-acting) and 50% insulin lispro protamine (intermediate-acting). It is used to manage blood sugar levels in people with diabetes, providing both quick and long-lasting effects. The 3ml cartridges are designed for use with insulin pens, offering convenient and accurate dosing. The 5-cartridge pack provides a sufficient supply for ongoing diabetes management.