Liletta is an IUD that is proven to be effective at preventing pregnancy for up to three years. The procedure is quick and done in-office, meaning no downtime is needed. Completely reversible, you choose if you want it removed before the three year mark or before. Liletta is a small, T-shaped device made of flexible plastic and contains a progestin hormone called levonorgestrel. It does not contain estrogen and does not require a certain BMI level to be effective.