Aspirin is usually the only pain reliever I carry in a FAK - reliable and useful in a variety of situations. And we are talking about first aid, not more advanced modes of treatment, right? I am at the age where I am taking 81 mg of aspirin daily and I still get out in the woods. I certainly hope I don't experience a heart attack in the boondocks, because I suspect I would need a lot more than a couple of aspirin. Speedy transport to definitive medical care is hard to come by in an outdoors setting.