The abortion pill mifepristone has become one of the most debated medications in the United States, sitting at the center of ongoing legal and political battles over reproductive healthcare. Despite decades of scientific research supporting its safety and effectiveness, anti-abortion groups continue to challenge its approval by the US Food and Drug Administration (FDA), claiming the drug was not adequately studied before being authorized for use.
Approved by the FDA in 2000, mifepristone is widely used as part of a medication abortion regimen and has since become one of the most common methods for ending early pregnancies in the United States.
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Mifepristone is sold under the brand names Mifeprex and Korlym and is also known as RU-486. The medication works by blocking progesterone, a hormone essential for maintaining pregnancy. Progesterone helps support the lining of the uterus, which allows a fertilized egg and developing embryo to grow.
When progesterone is blocked, the uterine lining breaks down, and the pregnancy can no longer continue. After taking mifepristone, patients typically take a second medication called misoprostol within 24 to 48 hours. Misoprostol causes the uterus to contract and empty through bleeding and cramping. The two-drug combination can be used up to 70 days after the first day of a person’s last menstrual period. Research shows the regimen is about 99.6 per cent effective in ending early pregnancies.
Anti-abortion groups continue to challenge its approval by the US FDA, claiming the drug was not adequately studied before being authorized
Studies have shown that the safety profile of mifepristone is comparable to common over-the-counter medications such as ibuprofen and acetaminophen. Analysts have also noted that the risk associated with mifepristone is lower than that of several widely prescribed medications, including some antibiotics and erectile dysfunction drugs.
Like most medications, mifepristone can cause temporary side effects, although serious complications are rare. Major complications such as severe infection, hospitalization, or heavy blood loss occur in fewer than 0.3 per cent of patients, according to medical experts. Reported side effects may include:
The growing use of medication abortion has intensified political and legal debates in America. Anti-abortion advocates have filed lawsuits arguing that the FDA should reverse or restrict approval of the drug. Supporters of reproductive rights argue that the challenges ignore decades of scientific evidence and could limit access to essential healthcare.
Medication abortion has steadily become more common in the US over the last two decades. Data from the Guttmacher Institute shows that medication abortions accounted for less than 10 per cent of abortions in 2001, rising to 63 per cent by 2023.
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