The primary hypothesis is that continuous administration of an OCP (CCOCP regimen) will result in more pain relief than a traditional 21/7 administration in primary dysmenorrhea (PD) patients.

It is well established that excess prostaglandin production in primary dysmenorrhea (PD) leads to ischemia of the uterine muscle, which consequently causes pelvic pain. A large number of drugs have been studied for pain relief in dysmenorrhea patients with non-steroid anti-inflammatory drugs (NSAIDs) being the most effective with the overall success rate of more than 75%. Oral contraceptive pills (OCP) are also an established treatment for PD with the success rate of 70%. Lately, OCP's have been used continuously in patients with endometriosis and had better pain control than traditional administration of OCP.

Inclusion Criteria:

• Healthy women ages 18-35 with a history of PD (onset < 3 years after menarche).
• Subjects must have had regular (25-31 day) menstrual cycles for the three month period preceding enrollment, with symptoms of moderate to severe PD during those cycles.

Exclusion Criteria:

• Patients who have contraindications to OCP therapy.
• Known or suspected secondary dysmenorrhea (major abdominal or pelvic surgery, endometriosis, pelvic inflammatory disease (PID), ovarian cysts, pathological vaginal secretion, chronic abdominal pain, inflammatory bowel disease, irritable bowel syndrome).
• Concomitant treatment with oral contraceptives, GnRH agonists and antagonists, antiandrogens, gonadotropins, anti-obesity drugs.
• The use of contraceptive implants, injectable contraceptives or intrauterine devices. The washout period on all these medications will be 3 months.
• Migraines, depression requiring hospitalization or associated with suicidal ideation during previous estrogen or ocp use.
• Known or suspected hypersensitivity to trial drug.
• Patients enrolled simultaneously into other investigative studies that require meds.

6 months