It is a shortacting insulin, starts working within 1020 minutes after injection. It works similar to insulin produced by the body. Insulin facilitates reuptake of sugar in muscle and fat cells and also suppresses the production of sugar in the liver.This manmade insulin product is the same as human insulin. It replaces the insulin that your body would normally make. It is a shortacting insulin. It works by helping blood sugar (glucose) get into cells so your body can use it for energy. This medication is usually used in combination with a medium or longacting insulin product. This medication may also be used alone or with other oral diabetes drugs (such as metformin).