Efficacy and Safety Study of Lidocaine Vaginal Gel for Recurrent Dysmenorrhea (Painful Periods)

The primary objective of this study is to evaluate the efficacy of 10% (150 mg) lidocaine gel compared with placebo in reducing the severity and onset of primary dysmenorrhea in women with recurrent dysmenorrhea. The secondary objectives of this study are the following: * to assess the safety of 10% (150 mg) lidocaine gel compared with placebo * to evaluate electrocardiograms (ECGs) for potentially significant QT changes at approximate peak lidocaine plasma concentration after 4 days of dosing with 10% (150 mg) lidocaine gel.