Plan B often works by preventing implantation of a human embryo in the uterus, thereby causing death of the new life. It can also act by preventing or delaying ovulation. The American College of Obstetrics and Gynecology (ACOG) has defined pregnancy as implantation of a fertilized egg into the uterus, not conception. So, technically speaking, using ACOG’s definition of pregnancy, Plan B does not cause an abortion. For this reason a lot of media outlets are saying that “Plan B is not an abortion pill,” or “Plan B does not cause an abortion.”
The mechanism of action (MOA) of Plan B is becoming an increasingly important issue. The American Academy of Pediatrics policy statement on emergency contraception also states that physicians should counsel patients on the mechanism of action of emergency contraception. Yet many physicians are not discussing the full mechanism of action of Plan B.
Most medical professionals and ethicists have come to believe that Plan B given in the fertile window works by primarily by preventing or blocking ovulation. This is not true. Plan B’s own website states that Plan B One-Step works primarily by, ‘Altering the endometrium, which may inhibit implantation’ – the implantation of a human embryo.
Research shows that ~80% of women who take Plan B in the fertile window still ovulate, yet the drug is still very effective in preventing pregnancy. There is a great article that explains this science in detail, “The State of The Science, Why Catholic Hospitals Should Not Dispense Plan B.” I’ve republished it with permission of the authors here:
There is evidence that oral contraceptives (birth control pills) can work through a similar mechanism, also preventing implantation of an embryo.
Many health care professionals promote contraceptives and emergency contraceptives such as Plan B as a good way to reduce or prevent abortions. In reality, though, we are just killing life at an earlier stage. It’s forcing us, as Catholics and Christians, to really ponder the miracle of life.
Many, if not most, of my colleagues think I am rather crazy for even caring about this issue. How can we continue to promote a culture of life in this atmosphere?
Copyright 2013 Kathleen Berchelmann, MD