The Insulin Human Winthrop range is comprised of fast-acting insulin solutions (Insulin Human Winthrop Rapid and Insulin Human Winthrop Infusat) that contain soluble insulin, an intermediate-acting insulin suspension (Insulin Human Winthrop Basal) that contains isophane insulin, and combinations of fast- and intermediate- acting in various proportions (Insulin Human Winthrop Comb): • Insulin Human Winthrop Comb 15: