Sponsored. 1  A word on herbs A word on herbs Overactive bladder (OAB) is most commonly treated with prescription medications to control bladder muscles. 2  Bladderwrack Bladderwrack Bladderwrack is a form of seaweed. 3  Gosha-jinki-gan Gosha-jinki-gan Other herbs have a little more backing from science, like Gosha-jinki-gan.