I had to cross this bridge myself half way into treatment with a biologic called Enbrel
that was recommended for my psoriasis. Unlike other systemtics, Enbrel supposedly wasn't liver toxic and in fact one preliminary study suggested it might help SVR. Still, given my RVR, I was reluctant to add another immunosuppresive to the mix and didn't. I'm sure Oxymatrine works on a different mechanism, but again, if it ain't broke, don't fix it, and if treatment seems to be working, don't change things.