Mirena (Hormonal Contraceptive) : How does it Act ?

 Dr Deepika Tiwari, Gynecologist, Gurgaon 9911821669
www.gurgaongynae.in
http://www.drdeepikatiwari.blogspot.com/
http://www.gurgaongynecologist.webs.com/

Mirena acts by

• Supplements the endometrial action of progestins to foreign body reaction
• Endometrium becomes decidualized, with atrophy of glands
• Inhibition of implantation
• Inhibition of sperm capacitation and survival

The Ovarian functions are NOT disturbed; the cycles remain ovulatory in 85 percent of patients, regardless of bleeding pattern.

Few Shortcomings of Mirena include; irregular bleeding and scanty menses. Amenorrhoea may occur in up to 50 % of patients.