Admelog is a brand (trade) name for insulin lispro and it is a fast-acting insulin. Admelog starts working within 0 to 15 minutes of administration, can be given 15 minutes before a meal or with a meal, peaks in 30 to 90 minutes,keeps working for less than five hours (usually two to four hours), should generally be used in regimens with intermediate or long-acting insulin and is more convenient and safer than regular insulin.