Insulin is primarily used as a medication to control blood sugar levels in people with diabetes, especially in those with type 1 diabetes (where the body makes little or no insulin) and in some cases of type 2 diabetes (when blood sugar cannot be controlled with oral medications alone)[1][3][5].
Its main uses include:
- Management of type 1 diabetes: Insulin is essential because the body cannot produce it naturally[1][3][5].
- Control of type 2 diabetes: Used when blood sugar remains too high despite oral medications, diet, and exercise[1][3][5].
- Treatment of gestational diabetes: Occasionally used when blood sugar cannot be controlled with lifestyle changes during pregnancy[1].
- Treatment of certain acute complications: Such as diabetic ketoacidosis and hyperosmolar hyperglycemic states[4].
- Treatment of high blood potassium (hyperkalemia): Insulin is sometimes used together with glucose to help reduce dangerously high potassium levels in the blood[4].
How insulin works: It facilitates the movement of sugar (glucose) from the blood into the body’s tissues for energy use, and stops the liver from making more sugar[2][3][5]. By controlling blood sugar, insulin helps prevent serious diabetes-related complications, including heart disease, nerve damage, kidney failure, and vision loss[5].
There are multiple forms of insulin, including rapid-acting, short-acting, intermediate-acting, and long-acting types, allowing individualized therapy for different needs[2][3].