Commonly used hypoglycemic drugs include oral hypoglycemic drugs and insulin, among which fast-acting oral hypoglycemic drugs include glipizide, glipizide and repaglinide. Glipizide and glipizide reach their peak effect 1-2 hours after taking the drug, and usually need to be taken half an hour before three meals. Repaglinide reaches its peak effect within one hour after taking the drug and is cleared in 4-6 hours, and is usually taken 15 minutes before meals. Due to the fast onset and short duration of action, rapid-acting oral hypoglycemic agents have a better effect on postprandial glucose control. Fast-acting insulins include regular human insulin and rapid-acting insulin analogues. Regular human insulin generally takes effect half an hour after injection, with an action time of 8 hours, and needs to be injected half an hour before three meals. Fast-acting insulin analogues include menthol insulin and lysergic insulin, which have an onset of action of about 15 minutes and a duration of action of 3-5 hours, and because of their rapid onset of action, fast-acting insulin analogues can be injected before meals.