A Study to Evaluate the Effect of Contraceptive Vaginal Rings on Primary Dysmenorrhea (P08257/MK-8175A/MK-8342B-057)

Inclusion Criteria: * Body mass index (BMI) ≥18 and ≤35 * Established diagnosis of primary dysmenorrhea * If of child-bearing potential must agree to use condoms for contraception during the entire screening period, treatment period, and post-treatment period until the final study visit, unless she or her partner are surgically sterilized * Agree to stop using hormonal contraceptive (combined or progestin-only), or a non hormonal intrauterine device (IUD) * Regular menstrual cycles ranging from 24 to 35 days in length Exclusion Criteria: * Any of the following contraindications to the use of contraceptive steroids including: presence or a history of venous or arterial thrombotic/thromboembolic events or cerebrovascular accident (stroke, history of migraine with focal neurological symptoms, diabetes mellitus with vascular involvement, severe or multiple risk factor(s) for venous or arterial thrombosis, severe dyslipoproteinemia, severe hypertension, pancreatitis or a history thereof if associated with severe hypertriglyceridaemia, presence or history of severe hepatic (liver) disease, including benign or malignant tumors, known or suspected sex steroid-influenced malignancies, and/or undiagnosed vaginal bleeding * Pregnant or breastfeeding * Secondary dysmenorrhea * Has not had spontaneous menstruation following a delivery or abortion * Participated in an investigational drug study within 30 days * History of malignancy ≤5 years * Documented abnormal cervical smear result w…