Is there behind the counter medecine for bv?

Over the counter?: I'm assuming you mean over-the-counter medication. There are some probiotic pills available over-the-counter which attempt to restore the healthy bacteria in your vagina, but it's unknown how well these really work. Your doctor can treat BV easily with antibiotics, but those need a prescription.

No: Treatments for BV are prescription antibiotics, which should be taken until gone, even if symptoms clear up sooner.