whether oral contraceptives are safe and effective in women who are obese

There's controversy about whether oral contraceptives are safe and effective in women who are obese.

OCs seem to have a slightly higher failure rate in obese women. Failure rates increase from about 2 per 100 women per year at a BMI of 25...to about 3 per 100 women per year at a BMI of 35.

Obese women also have a higher risk for thrombosis due to OCs.

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