Suppression Of Bacterial Vaginosis (BV) [SUBVert]

This is a Phase II randomized, double-blind, placebo-controlled study screening approximately 600 adult females, aged 18-55, with a goal to enroll approximately 250 participants to achieve 200 evaluable participants at the test of cure (TOC) visit. The study is designed to determine the clinical efficacy of an investigational product (IP), TOL-463 Insert, in suppressing Recurrent Bacterial Vaginosis (RBV) when administered to women who have a history of RBV and have been successfully cleared of their current Bacterial Vaginosis (BV) infection administering 500 mg of oral metronidazole, twice a day for 7 days or another CDC-recommended BV treatment. Patient participation will be approximately 100 days while the study is conducted at 4 sites within the United States. The primary objective of the study is to evaluate the clinical efficacy of a twice-weekly application of TOL-463 vaginal insert in suppression of BV in women with a history of RBV following successful induction with oral metronidazole or a CDC-recommended BV treatment. Secondary objectives of the study are: 1) to evaluate the time to BV recurrence as defined by clinical criteria, 2) to evaluate the incidence of vaginal symptoms over study participation, 3) to evaluate acceptability of a twice-weekly application of TOL-463 vaginal insert in suppression of BV, and 4) to evaluate the safety of TOL-463 vaginal insert compared to placebo, including the incidence of secondary vulvovaginal candidiasis (VVC). The null hypothesis for the comparison is that there is no difference in cure rates between treatments, with a two-sided alternative.