SAN ANTONIO -

Following the birth of her now 10-year-old son, Cassandra Jackson chose the birth control product Essure after being told it was a good alternative to having a tubal ligation.

"(I was told) that there were less side effects, less downtime, and that it would be easier on my body," Jackson said.

Bayer, the manufacturer of Essure, promotes it as a surgery-free procedure with no downtime.

The way Essure works is that metal coils are implanted into a woman's fallopian tubes, essentially blocking them.

The coils contain nickel titanium alloy.

"I knew I was allergic to some metals but I was never asked about that," Jackson said.

Jackson takes an arsenal of pain relievers.

"I can't hardly do anything. Most of the time, I'm curled up in the fetal position on the couch," Jackson said.

She said she suffers from migraines, severe pelvic pain and feels certain it is from the coils, one of which she says can not currently be located, even by 3D ultrasound.

"I feel violated and victimized, but at the same time, I'm excited about getting my partial hysterectomy because I can start to live again," Jackson said.

Gynecologist Dr. Steve McCarus said he's performed multiple hysterectomies over the years to remove the coils.

One of his patients, Nikki Morris, said she began having problems just four months after the coils were implanted.

A conversation with her mom made her question the implants.

"She said, 'Nikki, you have an allergy to nickel. You can't even have your ears pierced,'" Morris said.

"The only way to get her feeling back to normal would be to remove the tubes and the uterus," McCarus said.

There is an Essure Problems group on Facebook populated with women from all over the country who have similar stories. Some of these women said they wished they had known reversal would mean hysterectomy.

There were more than 600 adverse events reported during the last decade on the FDA website. Complaints ranged from severe pelvic pain to device migration to allergic reactions to nickel.

To read complaints, click here to visit the FDA's MAUDE Reports, also known as the Manufacturer and User Facility Device Experience.

Bayer, the manufacturer of Essure sent this statement, as well as a video statement:

"Essure was approved by the FDA in 2002, and has a well documented benefit-risk profile, with over 400 peer reviewed publications and abstracts supporting Essure's safety, efficacy and cost effectiveness. Approximately 750,000 women worldwide rely upon the Essure procedure for permanent birth control.

"As part of our commitment to patient safety, we continuously monitor and review the safety profile oof our products worldwide. No safety signal has been observed for Essure that would change our position that Essure has a favorable benefit-risk ratio. Drug related adverse reports are consistent with those seen in clinical trials and reported in long-term study. I strongly encourage you to reach out to the US Food & Drug Administration for the most current, and most complete, information available regarding adverse events.

"The FDA reviewed, among other things, the results from a five-year Essure study late last year. The FDA found that "although there is evidence of complications, as there are with all medical devices, overall results from this study did not demonstrate any new safety problems or an increased incidence of problems already known."

To see the video statement from Bayer Healthcare's Dr. Edio Zampaglione, click here.

For a list of recent stories April Molina has done, click here.