Mixtard 30 (100 IU/ml) is a combination insulin used to manage blood sugar levels in people with diabetes. It is a pre-mixed insulin formulation, combining two types of insulin in one vial: 30% Short-acting insulin (Regular Insulin): This portion works quickly to lower blood sugar, usually beginning to act within 30 minutes of injection and peaking in about 2-4 hours. 70% Intermediate-acting insulin (NPH Insulin): This portion is slower acting and provides a longer duration of action, helping to control blood sugar over a longer period (up to 12-18 hours).