whether oral contraceptives are safe and effective in obese women

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

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 are also at higher risk for thrombosis due to OCs.

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