My wife has bactieral vagnouses how does she get rid of it doctors already perscribed it went away then came back?

Antibiotics: Check out following re bv: http://www.Cdc.Gov/std/bv/stdfact-bacterial-vaginosis.Htm and http://www.Mayoclinic.Com/health/bacterial-vaginosis/ds01193. In other words, we don't know exactly why but douching & frequent partners increases risk of upsetting balance of vaginal bacteria. Best to finish all prescribed antibiotics to minimize risk. Although not always done, consider treating male partner.