Accidents, calamities, acts of God, terrorism etc.

I am not familiar with pain meds, and when I did a search, the results were a bit overwhelming. I'm wondering if you could drop a line as to what you think might be a strong, generally safe pain medication (if there is such a thing, and I know this is vague), to have on hand in case trauma should befall one of my family members or me.

Thank you for your help. Although I don't post much, I do read and I'm appreciative of the helpful and respectful tone of this board.