Levonorgestrel/ethinyl estradiol (LNG/EE) is an investigational drug that is being developed as an oral contraceptive (birth control pill). The purpose of this trial is to compare different preparations of LNG/EE by assessing the way they are absorbed into the blood.

Inclusion Criteria:

• Women aged 18 to 35 years.
• Healthy as determined by the investigator on the basis of medical history and screening evaluations.
• Must have a history of normal menstrual cycles (24 to 34 days) for the 3-month period preceding entry into the study.

Exclusion Criteria:

• Any surgical or medical condition that may interfere with the absorption, distribution, metabolism, or excretion of the test article.
• Presence, history, or family history of thrombophlebitis, thrombosis, or thromboembolitic disorders, deep vein thrombosis, pulmonary embolism, or known coagulopathy.
• Bethesda system report of low-grade squamous intraepithelial lesion or greater for a cervical cytologic smear obtained within the last 3 months.