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Progestin-releasing intrauterine systems
T Luukkainen1, P Pakarinen, J Toivonen
1Steroid Research Laboratory, Institute of Biomedicine, University of Helsinki, Helsinki, Finland.
Seminars in Reproductive Medicine
|December 1, 2001
Summary
The levonorgestrel-releasing intrauterine system (LNG IUS) effectively reduces menstrual bleeding by acting locally on the endometrium. While generally safe, it does not protect against sexually transmitted infections, necessitating condom use for at-risk individuals.
Area of Science:
- Reproductive Health
- Gynecology
- Endocrinology
Background:
- The levonorgestrel-releasing intrauterine system (LNG IUS) is a widely used contraceptive method.
- Its mechanism involves local action on the endometrium, influencing menstrual patterns.
Purpose of the Study:
- To detail the effects of the LNG IUS on the endometrium and menstrual blood loss.
- To outline the associated health benefits and potential side effects of LNG IUS use.
Main Methods:
- The study describes the physiological changes induced by local levonorgestrel release.
- It analyzes the impact on endometrial proliferation and responsiveness to estrogen.
- Observational data on menstrual blood loss, duration, and side effects are presented.
Main Results:
- The LNG IUS causes endometrial transformation, leading to reduced menstrual blood loss and duration.
- Amenorrhea is common after 9 months of use, despite normal ovarian function.
- Reduced risk of pelvic inflammatory disease and potential side effects like mood changes, acne, and weight gain are noted.
Conclusions:
- The LNG IUS is an effective contraceptive with significant benefits, including reduced menstrual bleeding and lower PID risk.
- Endometrial suppression is the primary mechanism for these benefits.
- Users must be informed about potential side effects and the lack of STI protection, recommending concurrent condom use when necessary.