Study 1: "A prospective, multicenter, open-label, single-arm trial conducted in the United States."
Study 2: "A randomized, multicenter, single-blind comparator-controlled trial conducted in the United States, United Kingdom, and Ireland."
Side effects for this drug include "headache, nausea, abdominal pain, dysmenorrhea, fatigue, and dizziness." These side effects can also be noted in other emergency contraceptive tablets. It's advised to inform oneself on the emergency contraceptive before ingesting it.
[Source: http://www.pharmacist.com/AM/Template.cfm?Section=Pharmacy_News&template=/CM/ContentDisplay.cfm&ContentID=24070]