- Girls who are postmenarche or sexually active, must have a negative urine pregnancy test prior to the baseline visit, must be using a medically acceptable method of birth control, and must agree to continue use of this method for the duration of the study (and for 30 days after participation in the study). Acceptable methods of birth control include the following: barrier method with spermicide; steroidal contraceptive (eg, oral, transdermal, implant, or injected) in conjunction with a barrier method; intrauterine device (IUD); and abstinence.