Ulipristal acetate for emergency contraception.

Objective: To review the pharmacology, pharmacokinetics, efficacy, and safety of data of ulipristal acetate, a new emergency contraceptive approved for use up to 120 hours after unprotected intercourse.

Data Sources: Articles pertaining to the topic were identified and reviewed through searches of PubMed (1994-March 2011) and clinicaltrials.gov, using the key terms ulipristal and CDB-2914.