Patient's weight limits the effectiveness of emergency contraception
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Obese women are at substantially higher risk for failure of emergency contraception compared to normal weight women. UPA is more effective than LNG, especially among women with a BMI of 26–35 kg/m2, a group in which LNG is ineffective. For women with a BMI ≥36 kg/m2, emergency contraceptive pills are essentially ineffective, and other methods such as the copper intrauterine device should be recommended.
Evidence-based practice 17, no. 08 (2014): 4