Keep getting BV:(

I keep getting bv. I call the dr I get a script it goes away I have sex then it all comes back I get a yeast infection bv and the my period which then mean no sex life :( any suggestions on how to keep the bv at bay? I take a probiotic and acidophilus to help with the yeast and also cranberry. But I don't know if there's something I can take to help the bv besides a perscription :(