Emergency Contraception Algorithm and Guide for Clinicians.

There are currently three forms of emergency contraception: oral levonorgestrel, oral ulipristal acetate, and the copper intrauterine device. The copper intrauterine device is the most effective, followed by ulipristal acetate and levonorgestrel, respectively. Although levonorgestrel is the least effective method, studies show that more prescribers are familiar with it and that is the most frequently used method. Clinicians should consider several factors when helping women make informed medical decisions regarding emergency contraception, including access to the products, a woman's individual preference, timing since unprotected intercourse, body mass index or weight, and initiation or resumption of routine contraception. This article explains and summarizes these considerations and provides an algorithm to guide clinicians.