HUMALOG® Mix50/50™ KwikPen® 50% insulin lispro protamine suspension and 50% insulin lispro injection (rDNA origin) 100 units/mL, 3 mL penHUMALOG® Mix50/50™ KwikPen® (“Pen”) is a disposable prefilled pen containing 300 units of HUMALOG Mix50/50. You can give yourself more than 1 dose from the Pen. Ea..