$\bullet$ Levonorgestrel hormone is released from LNG-20. It is highly effective for contraception. The risk of unwanted pregnancy is lower with LNG-20 because it causes endometrial atrophy and alter the stroma to inhibit the process of implantation.

$\bullet$ Lippes loop is an IUD impregnated with barium sulphate. IUDs like CuT and multiload-375 release copper that suppress the motility of sperm thus reducing its fertilising capacity. Thus, Lippes loop, CuT and multiload-375 are not hormone releasing IUDs.