HumulogJrKwikPenThe Humalog® Junior KwikPen®  [insulin lispro injection 100 units/mL] is now available by prescription for the treatment of diabetes in the U.S. Humalog Junior KwikPen is the only prefilled, disposable half-unit insulin pen.  Humalog Junior KwikPen, which is lighter and shorter than other half-unit insulin pens, provides an option for people who prefer a prefilled pen and need the precision of half-unit dosing, such as those with insulin sensitivity and some older adults for whom rounding to the nearest whole-unit dose is not adequate.