Lantus is a long lasting medication that is used to control blood sugar. It provides a steady amount of insulin throughout the day.Lantus is a hormone that is naturally produced by the pancreas.Lantus is given in a single dose every 24 hours.It is in liquid form outside the body. Once the liquid is injected it turns into tiny crystals.The crystals disolve during the day, little bits at a time. It is processed thru the body and released throughout the day. This helps keep the bodies sugar lever from spiking and falling during the day.