As I understand it, Usnea tincture is good for fending off infection -- put some on the wounds topically, and take it internally too for extra infection fighting strength...
You can also use olive leaf tincture -- the herbalist I work for often describes alternating between the two, especially early after a potential infection risk... You want to be sure the skin doesn't heal over on the outside while there is still any infection underneath!
And there's no harm from the herbs in the case that you don't have any infection, plus, herbs are way cheaper than big pharma's pills!
You can probably get these herbs locally, but if not, here is the place I work for -- you can order online...
http://www.eaglepeakherbals.com/
They're totally hip to the coming crash, very cool place to work!
Sorry for the sales pitch, I won't make a habit of it. But learning about herbal medicine seems totally on-topic for preparing for post-peak life...
"... among the ways available in which a man can die, it is a rare and signal distinction to be killed by a leopard."
-- Raymond Dasmann