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Strategies identified to improve oral contraceptive success with obese women
Date:7/28/2014

PORTLAND, Ore. The findings of a new study suggest two ways to effectively address the problem that birth control pills may not work as well in obese women, compared to women of a normal body mass index.

Birth control pills are a one-size-fits-all method, researchers say, but as the population has increased in weight, concern has grown about how well the pill works for obese women. Studies have consistently found that obesity has a negative impact on drug levels in the body, which may in turn affect how well the pill prevents pregnancy.

"Birth control pills have been shown in a large population study to fail at a higher rate in women who are obese," said Ganesh Cherala, an assistant professor in the Oregon State University/Oregon Health & Science University College of Pharmacy.

"Our original studies were focused on why this might occur," Cherala said, "and we found that obesity changes how a woman's body clears contraceptive hormones."

It takes longer for the pill to reach a steady state level in obese women, with possible impacts on efficacy of the birth control, and putting them at greater risk for a pill failure if they forget to take a pill or take it later.

In order to offset these changes, Cherala and Dr. Alison Edelman, an associate professor of obstetrics and gynecology at Oregon Health & Science University, studied two alternative strategies. They found that either a slight increase in the pill dose, from a very low dose to a low dose pill; or using the pill continuously without a "period week" off, appeared to counteract the changes that obesity causes.

This, in turn, may provide improved pregnancy prevention for women of differing weights who use the pill, the researchers said. Their work is published in Contraception, a professional journal, and was supported by the National Institutes of Health.

"Since oral contraception remains one of the most popular forms of birth control
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Contact: Ganesh Cherala
ganesh.cherala@oregonstate.edu
503-418-0447
Oregon State University
Source:Eurekalert

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