Compared with rapid-acting and short-acting insulin, long-acting insulin has a slower onset of action, which is more conducive to stabilizing blood glucose levels throughout the day and reducing the occurrence of nighttime hypoglycemia, and it is suitable for patients whose blood glucose is not particularly high and who are susceptible to hypoglycemia, such as elderly patients. It is usually used in combination with oral hypoglycemic agents (or short-acting insulin) to supplement basal insulin. Insulin is suitable for patients with type 1 diabetes mellitus, type 2 diabetes mellitus that cannot control blood glucose well with oral hypoglycemic drugs alone, and special types of diabetes mellitus, etc. Long-acting insulin includes glycemic insulin, detrusor insulin, and so on. Adverse reactions such as pain at the injection site, subcutaneous fat atrophy, allergic reactions may occur after using long-acting insulin injections, and it is prohibited for people who are allergic to its ingredients. Long-acting insulin can provide diabetic patients with basal levels of insulin, with slow onset of action, which is conducive to stabilizing blood glucose throughout the day and reducing the incidence of nighttime hypoglycemia, and is particularly suitable for patients whose blood glucose is not particularly high and who are prone to hypoglycemia, such as elderly diabetic patients. It is usually used in combination with oral hypoglycemic drugs (or short-acting insulin). It can only be injected subcutaneously, not intravenously or for emergency use. Patients who need to use long-acting insulin treatment should be under the guidance of a doctor.