It seems the question began with essentially over the counter pain meds. Knowing what are appropriate and for who and when is the critical question. Knowing a few pain reducing measures is also helpfull. Applying heat or cold, massaging or elevating the injury and some acupuncture pressure points are non invasive options. Limiting material options to a single PSK led me to early adopt a two box system. One is solely devoted to first aid. I can access it instead of digging through sparklites and condoms for a bandaid while bleeding to death, and carry substantially more. Carrying two in opposite pockets also helps keep me from drifting to the left of a compass bearing ;O)