Several varieties of premixed insulins are available, combining insulins.
Examples of premixed insulin include Novolin 70/30, Humulin 70/30, Humalog 75/25, Humalog 50/50, and Novolog 70/30. The first number indicates the percentage of the mix that is a protamine suspension, akin to NPH insulin, and the second number indicates the percent of the mix that is fast acting. In Novolin and Humulin mixes the fast acting portion is R insulin. In Humalog mixes, Humalog (Lispro) is the fast acting portion. In Novolog mixes, Novolog (Aspart) is the fast acting portion.