### Types of Insulin and Their Functions Insulin is a hormone that helps regulate blood sugar levels. People with diabetes may need insulin injections to manage their blood sugar. There are different types of insulin, each with its own onset, peak, and duration: 1. **Rapid-acting insulin**: Starts working about 15 minutes after injection, peaks in about an hour, and lasts 2-4 hours. Taken before meals. 2. **Short-acting insulin**: Starts working 30 minutes after injection, peaks in 2-3 hours, and lasts 3-6 hours. Taken before meals. 3. **Intermediate-acting insulin**: Starts working 2-4 hours after injection, peaks in 4-12 hours, and lasts 12-18 hours. Taken twice a day. 4. **Long-acting insulin**: Starts working several hours after injection and lasts about 24 hours. Often used with rapid- or short-acting insulin. Your doctor will help you choose the best type and delivery method, such as an injection pen, syringe, or pump, based on your condition and lifestyle. ### Insulin Pump An insulin pump delivers rapid- or short-acting insulin 24/7 through a small catheter under the skin. It's commonly used by people with type 1 diabetes but can also be used by those with type 2 diabetes. ### Side Effects and Overdose Insulin can cause side effects, including allergic reactions at the injection site. Overdosing on insulin can be serious and requires immediate medical attention. Contact a poison control center or emergency room if you suspect an overdose.