<prompt> Mirena is :Used in aboionsAntiprogesteroneProgesterone IUCDHarmonal implant  <response>: Ans. is c i.e. Progesterone IUCD Mirena is a progesterone IUCD. It contains 52mg levonorgesterel. eluting 20pg daily. Life span- 5 years Failure rate 0.1-0.4HMY Mode of action : Inhibits feilisation Thickens cervical mucus Inhibits sperm function Suppresses endometrium and prevents implantation and inhibits ovulation only in 10-15 cases. Within first seven days of onset of menstruation Immediately after first or second trimester termination of pregnancy After 6 weeks postpaum with contraception for 7 days. 