Plan B® (levonorgestrel) is not recommended for routine use as a contraceptive.
Plan B® (levonorgestrel) is not effective in terminating an existing pregnancy.
Effects on Menses
Menstrual bleeding patterns are often irregular among women using progestin-only oral contraceptives and in clinical studies of levonorgestrel for postcoital and emergency contraceptive use. Some women may experience spotting a few days after taking Plan B® (levonorgestrel) . At the time of expected menses, approximately 75% of women using Plan B® (levonorgestrel) had vaginal bleeding similar to their normal menses, 12-13% bled more than usual, and 12% bled less than usual. The majority of women (87%) had their next menstrual period at the expected time or within ± 7 days, while 13% had a delay of more than 7 days beyond the anticipated onset of menses. If there is a delay in the onset of menses beyond 1 week, the possibility of pregnancy should be considered.
Last reviewed on RxList: 5/24/2007
This monograph has been modified to include the generic and brand name in many instances.