A Study to Evaluate the Exposure of Norelgestromin and Ethinyl Estradiol From Commercial Lots of EVRA (a Transdermal Contraceptive Patch Manufactured by LOHMANN Therapie-Systeme) and CILEST (an Oral Contraceptive)

This single-center, open-label, randomized, partially-balanced, incomplete block design study will consist of a pre-treatment phase (a screening period lasting up to 21 days), an open-label treatment phase (three 7-day treatment periods separated by 21-day washouts), and a post-treatment phase (a follow-up or early withdrawal visit). Total participation in the study is approximately 67 days. Approximately 54 subjects will be enrolled. The study population comprises healthy women, ages 18 to 45 years inclusive, who weigh at least 110 pounds, have a body mass index (BMI) between 16 and 29.9 kg per meter squared. Subjects will wear an EVRA® patch or take CILEST® during each of the three 7-day treatment periods; treatment periods will be separated by a 21-day washout period. When a subject is to wear EVRA®, a patch from 1 of the 6 selected commercial lots will be applied on the buttock and worn for 7 days. Patches will be applied by the investigator or designated study unit personnel. All patches will be worn on the upper outer quadrant of the same buttock, but not necessarily in the exact same position. The investigator or designated study unit personnel will remove the patches and will evaluate the adhesion of the patches before removal. When a subject is to receive CILEST®, tablets from 1 of the 3 selected commercial lots will be administered daily for 7 consecutive days. A minimum of 21 days after removal of the patch or the seventh dose of CILEST®, the subject will begin another treatment period, until she completes 3 open-label treatment periods. Subjects will be confined to the study unit for blood sample collections for determination of NGMN, NG, and EE plasma concentrations. Blood samples will be collected (via venipuncture) immediately before each dose and at specified time points after each dose is administered. Pharmacokinetic parameters of NGMN, NG, and EE, including Cmax, tmax, and AUC, after each treatment will be estimated by standard methods. Safety will be assessed throughout the study, and will be based on adverse events and changes in physical and gynecologic examinations (including breast examinations), vital signs, electrocardiograms (ECGs), and clinical laboratory test results. Three 7-day treatment periods; treatments separated by 21-day washout. Based on the randomization schedule, some subjects will wear an EVRA® patch in all 3 periods (on the upper outer quadrant of the buttock for 7 days), some will wear a patch in 2 periods and take CILEST® oral tablets once daily in 1 period, and some will wear a patch in 1 period and take CILEST® oral tablets once daily in 2 periods.