The present invention generally relates to methods and compositions for treating pathogenic vaginal biofilms. More specifically, the invention relates to pharmaceutical compositions comprising a combination of boric acid and diethylaminetetracetic acid (EDTA) and to methods of using such compositions to treat or prevent biofilm formation associated with vaginal infections, such as bacterial vaginosis (BV), vulvovaginal candidiasis (VVC), trichomoniasis or mixed infections.