Is there a doctor in the house?

So if I were to have one character on the floor, in shock, with a nasty, bleedy, but ultimately not life-threatening gunshot graze on the head, and another who's pondering feeding her a codeine pill for the pain, would this be a good idea or a bad idea on his part? As in, is this destined to cause terrible complications and/or endanger her life further?

Your writer thanks you.