The Ethical and Religious Directives for Catholic Health Care Services allows the use of an emergency contraceptive for a woman who has been raped, as a defense against her attacker's sperm, provided the drug prevents fertilization and does not act against a conceived human life. Catholic emergency rooms around the country have been pressured to provide Plan B (LNG-EC) to patients seeking help after a sexual assault. Catholic bioethicists have supported the use of this drug based on their interpretation of the scientific literature regarding its mechanism of action. This paper presents a review of the mechanisms of action of LNG-EC when given during the fertile window, showing a high probability that it acts against human life rather than preventing fertilization, and proposes another class of drugs as a possible alternative.
levonorgestrel rape emergency contraception, Catholic health care sexual assault protocol, Ethical Religious Directives emergency contraception, LNG-EC fertilization prevention rape, Peoria Protocol emergency contraception, emergency contraception moral analysis, post-rape hormonal intervention ethics, ovulation test emergency contraception protocol, Catholic hospital sexual assault care
PMID 24899748 24899748 DOI 10.1179/2050854914Y.0000000017 10.1179/2050854914Y.0000000017 Raviele et al. 2014, Raviele 2014
Cite this article
Raviele, K. M. (2014). Levonorgestrel in cases of rape: How does it work? The Linacre Quarterly, 81(2), 117-129. https://doi.org/10.1179/2050854914Y.0000000017
Raviele KM. Levonorgestrel in cases of rape: How does it work? Linacre Q. 2014;81(2):117-129. doi:10.1179/2050854914Y.0000000017
Raviele, K. M. "Levonorgestrel in cases of rape: How does it work?" The Linacre Quarterly, vol. 81, no. 2, 2014, pp. 117-129.
Recent studies have identified that levonorgestrel administered orally in emergency contraception (LNG-EC) is only efficacious when taken before ovulation. However, the drug does not consistently prevent follicular rupture or impair sperm function. The present systematic review is performed to analyze and more precisely define the extent to which pre-fertilization mechanisms of action may explain the drug's efficacy in pregnancy avoidance. We also examine the available evidence to determine if pre-ovulatory drug administration may be associated with post-fertilization effects. The mechanism of action of LNG-EC is reviewed. The drug has no ability to alter sperm function at doses used in vivo and has limited ability to suppress ovulation. Our analysis estimates that the drug's ovulatory inhibition potential could prevent less than 15 percent of potential conceptions, thus making a pre-fertilization mechanism of action significantly less likely than previously thought. Luteal effects (such as decreased progesterone, altered glycodelin levels, and shortened luteal phase) present in the literature may suggest a pre-ovulatory induced post-fertilization drug effect. Plan B is the most widely used emergency contraceptive available. It is important for patients and physicians to clearly understand the drug's mechanism of action (MOA). The drug was originally thought to work by preventing fertilization. Recent research has cast doubt on this. Our review of the research suggests that it could act in a pre-fertilization capacity, and we estimate that it could prevent ovulation in only 15 percent or less of cases. The drug has no ability to alter sperm function and limited ability to suppress ovulation. Further, data suggest that when administered pre-ovulation, it may have a post-fertilization MOA.
This paper is a response to Dr. Kathleen Raviele's recent article on her critical analysis of the use of levonorgestrel given to women postsexual assault and her suggestion that the use of Meloxicam may be an ethical alternative.
There has been much debate regarding levonorgestrel emergency contraception's (LNG-EC's) method of action since 1999 when the Food and Drug Administration first approved its use. Proponents of LNG-EC have argued that they have moral certitude that LNG-EC works via a non-abortifacient mechanism of action, and claim that all the major scientific and medical data consistently support this hypothesis. However, newer medical data serve to undermine the consistency of the non-abortifacient hypothesis and instead support the hypothesis that preovulatory administration of LNG-EC has significant potential to work via abortion. The implications of the newer data have important ramifications for medical personnel, patients, and both Catholic and non-Catholic emergency room protocols. In the future, technology such as the use of early pregnancy factor may have the potential to quantify how frequently preovulatory LNG-EC works via abortion. Lay How Plan B (levonorgestrel emergency contraception) works has been vigorously debated ever since the Food and Drug Administration approved it in 1999. Many doctors and researchers claim that it has either no-or at most-an extremely small chance of working via abortion. However, the latest scientific and medical evidence now demonstrates that levonorgestrel emergency contraception theoretically works via abortion quite often. The implications of the newer data have important ramifications for medical personnel, patients, and both Catholic and non-Catholic emergency room rape protocols.
This article questions the conclusions drawn by the author of "The Mirena® Levonorgestrel-releasing Intrauterine System and Its Application to the Treatment of Menorrhagia: A Moral Opinion" (Linacre Quarterly 75 [2008]: 60–70), i.e., that it is justified to use this intrauterine device to treat heavy periods of unknown etiology by the principle of double effect.