If I remember correctly, it is (at least sometimes) used as an antiseptic isn't it? Problem is a Werewolf wouldn't realize you had it in you until after you were already Human tar tar! NOT a good thing to be.
In one of my favorite books called Those that hunt the night
Someone injects himself with silver nitrate just before a vampire bites him, and it kills the vampire
Of course they are both dead but the person had no escape
