The picture taken on September 8, 2016 shows a sign with the logo at the headquarter of German chemical company Bayer in Leverkusen, western Germany.

US seeds and pesticides maker Monsanto is in talks with German chemicals giant Bayer over a possible merger of their two agrochemicals divisions. / AFP / PATRIK STOLLARZ        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)
Bayer paid doctors for Essure birth control
02:59 - Source: CNN
CNN  — 

Even though it’s no longer on the market, new data has emerged around potential side effects of the permanent birth control device Essure.

The device, pulled from the US market two years ago amid complaints about side-effects, is associated with higher rates of chronic lower abdominal or pelvic pain and abnormal uterine bleeding compared to surgical sterilization, an early study shows.

Interim results of the postmarket study that was ordered by the US Food and Drug Administration were released on Wednesday. The results show that, following each procedure, incidence of chronic lower abdominal or pelvic pain was reported among 9.1% in the Essure group and 4.5% in the tubal sterilization treatment group. Incidence of abnormal uterine bleeding was reported among 16.3% in the Essure group and 10.2% in the tubal sterilization treatment group, the study says.

The interim data also show that women fitted with Essure had higher rates of gynecologic surgical procedures – including surgery to remove Essure – than patients who had tubal ligation. Pregnancy rates were similar among patients with Essure and those who got tubal ligation, Dr. Terri Cornelison, director of the FDA’s Health of Women Program, said in a statement.

A total of 1,128 women enrolled in the study at 60 investigational sites in the United States. There were 340 patients in the Essure group and 788 patients in the tubal sterilization group.

In 2016, the FDA ordered the pharmaceutical company Bayer to gather additional data on Essure’s risks and benefits and to compare them with laparoscopic tubal ligation – a procedure commonly referred to as having one’s tubes tied.

Then in 2018, Bayer announced it would no longer distribute or sell the Essure device in the United States. The FDA required Bayer to extend its postmarket surveillance study from three to five years.

The FDA said a five-year follow-up of patients in the study is ongoing and patients are still completing one-year follow-up visits.

“Although Essure is no longer available for implantation in the U.S., the FDA remains committed to evaluating long-term safety information in women who have received the device, including data from an FDA-required postmarket surveillance study,” Cornelison said.

“The FDA is working with Bayer, Essure’s manufacturer, to modify its study to include an additional interim analysis at one year of follow up after patients’ permanent birth control procedure – this is earlier than the previously planned analysis at three years,” Cornelison added. “We believe this change is important to continue to closely monitor patient outcomes and communicate about the results in a more meaningful way.”

Get CNN Health's weekly newsletter

Sign up here to get The Results Are In with Dr. Sanjay Gupta every Tuesday from the CNN Health team.

The FDA also noted that it continues to recommend that women who have been using Essure successfully to prevent pregnancy can and should continue to do so. Women who suspect the device may be related to symptoms they are experiencing, such as persistent pain, should talk to their doctor about what steps may be appropriate, according to the agency.

Removing the device comes with its own risks and the agency said patients should discuss the benefits and risks of any procedure with their health care providers before deciding on the best option for them.

Bayer issued a statement in response to the results published on Wednesday.

“The Essure 522 study is a five-year observational study that will not be completed for more than four years, and, as a result, the interim findings are incomplete and are subject to change. As the FDA itself notes: ‘This study is ongoing and the results are interim. Final analyses of endpoints will not be completed until the study concludes’ in 2025. It is therefore too early to draw any conclusions,” the company said in its emailed statement.

“While all birth control products and procedures have risks, the totality of scientific evidence on Essure demonstrates that its safety profile is consistent with the risks disclosed since its 2002 approval and is comparable to other female permanent birth control options,” the company said in part. ” The results of several large, real-world observational studies comparing patients with Essure to patients who have had tubal ligations consistently show that Essure’s safety profile is similar to that of tubal ligation. … Bayer remains strongly committed to women’s health, where we have long been a leader.”