Rapid-acting insulin is a type of insulin that starts to work quickly, usually within 15 minutes after injection. It is designed to help control blood sugar levels during meals by mimicking the natural insulin response of the body. This type of insulin is often used by people with diabetes to manage their blood glucose levels effectively. Common brands of rapid-acting insulin include Lispro, Aspart, and Glulisine. These insulins are typically injected just before or shortly after eating. Their quick action helps prevent spikes in blood sugar that can occur after meals, making them an essential part of diabetes management for many individuals.