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      Insulin

      Generic Name: Insulin (various formulations, including rapid-acting, short-acting, intermediate-acting, and long-acting)
      Common Brand Names:

      • Rapid-acting: Humalog (insulin lispro), Novolog (insulin aspart), Apidra (insulin glulisine)
      • Short-acting: Humulin R, Novolin R
      • Intermediate-acting: Humulin N, Novolin N
      • Long-acting: Lantus (insulin glargine), Levemir (insulin detemir), Tresiba (insulin degludec)
      • Mixed formulations: Humalog Mix, Novolog Mix

      Introduction

      Insulin is a peptide hormone crucial for glucose metabolism. In diabetes management, exogenous insulin is used to mimic the natural action of endogenous insulin to regulate blood glucose levels. It is essential in type 1 diabetes and often used in type 2 diabetes when oral agents are insufficient.

      Conditions of Use (Indications)

      1.Type 1 Diabetes Mellitus:

      • Essential for survival in patients due to absolute insulin deficiency.

      2.Type 2 Diabetes Mellitus:

      • For glycemic control when oral agents are inadequate.

      3.Gestational Diabetes Mellitus (GDM):

      • For controlling hyperglycemia in pregnancy.

      4.Diabetic Ketoacidosis (DKA) and Hyperosmolar Hyperglycemic State (HHS):

      • To correct hyperglycemia and metabolic derangements.

      5.Hyperkalemia:

      • In combination with glucose to drive potassium into cells.

      Mechanism of Action

      Insulin binds to the insulin receptor on target cells, activating the intrinsic tyrosine kinase activity of the receptor. This initiates a cascade of signaling pathways that:

      • Promote glucose uptake by increasing GLUT4 translocation to the cell membrane in muscle and adipose tissue.
      • Stimulate glycogenesis and lipogenesis while inhibiting gluconeogenesis and lipolysis.
      • Increase protein synthesis and decrease proteolysis.

      Different formulations of insulin vary in their onset, peak, and duration of action due to structural modifications affecting absorption and pharmacokinetics.

      Side Effects

      • Common Side Effects:
        • Hypoglycemia (most common).
        • Weight gain, injection site reactions, lipodystrophy (lipohypertrophy or lipoatrophy).
      • Serious Side Effects:
        • Severe hypoglycemia, leading to seizures or coma.
        • Allergic reactions, including anaphylaxis (rare).

      Harmful Interactions

      1.Beta-Blockers:

      • Mask symptoms of hypoglycemia (e.g., tachycardia).

      2.Alcohol:

      • Increases the risk of hypoglycemia.

      3.Thiazolidinediones (e.g., pioglitazone):

      • Can exacerbate fluid retention and increase the risk of heart failure when used with insulin.

      Contraindications

      1. Hypoglycemia.
      2. Known hypersensitivity to insulin or its components.

      Latest References

      1. American Diabetes Association (ADA) Standards of Care (2024).
      2. NICE Guidelines for Insulin Use in Diabetes (2023).
      3. Lancet Diabetes & Endocrinology (2023): Advances in Insulin Therapy.

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