Insulin lispro should be injected under the skin within 15 minutes before you eat. Your doctor will tell you how much insulin lispro to inject. Remember, you must eat 15 minutes after you take this insulin shot. Insulin lispro is a little more convenient to take than regular insulin. If you've been using regular insulin, you've had to inject the insulin and then wait 30 to 45 minutes before eating.
Many people find it hard to time regular insulin injections and mealtimes.
Sometimes they end up eating too early or too late. Then they don't get the best blood sugar control. Since insulin lispro is taken so close to meals, it may help you get the best possible blood sugar control. It's best that you mix insulin lispro only with Humulin U or Humulin N, which are brand names for certain longer-acting insulins. Insulin lispro should always be drawn into the syringe first.