By the time there are noticeable symptoms there isn’t a cure. The Milwaukee Protocol is now largely viewed as ineffective, but there is not a widely proposed alternative.

However, considering the protocol involves an induced coma, I’d say it’s preferable to going through end stage rabies even if it doesn’t save you. In fact, that may be part of why it took so long for it to be deemed ineffective, it is more merciful than palliative care alone.