Insulin Formulations and Administration

Active Ingredients and Composition

Mixtard 50 HM Penfill contains 50% soluble human insulin and 50% isophane human insulin in a premixed formulation, providing both rapid-acting and intermediate-acting components for glucose control 1
The formulation is designed for use in pen injection devices, with the "HM" designation indicating human insulin 2, 3

The regular insulin component has an onset of action within 30 minutes and should ideally be administered 30 minutes before meals for optimal effect, according to the American Diabetes Association 4
The NPH component provides intermediate-acting coverage with onset at approximately 1 hour, peak at 6-8 hours, and duration of approximately 12 hours, as recommended by the American Association of Clinical Endocrinologists 4

Consistent meal timing and content are required due to the NPH peak action profile to minimize hypoglycemia risk, as advised by the American College of Endocrinology 4
The formulation may carry a higher risk of nocturnal hypoglycemia compared to long-acting insulin analogs due to the NPH component, according to the Endocrine Society 4
The suspension should be inspected before each use to ensure it appears uniformly cloudy after gentle mixing, as recommended by the American Diabetes Association 5

Human insulin formulations like Mixtard 50 HM represent a cost-effective alternative to insulin analogs, with availability at approximately $25-35 per vial in some settings, as reported by the American College of Clinical Pharmacy 4