Carrying a basic first-aid kit can help you survive everything from a sore tooth to an upset stomach to relief for a blistered hand.
A well stocked first aid kit is a must for camping. Several companies, including Adventure Medical Kits and Outdoor Research, offer pre-stocked kits. If you want to assemble your own kit, go to Equipped to Survive for a suggested list of items to carry.
Be sure to add any prescription medications or unusual drugs or herbs that you regularly use to your kit. Note - you should follow directions on the label for use of all over-the-counter medications. Also, follow the directions of a physician for use of all prescription medications.
I find it useful to duplicate medications in other kits that I carry. For example, I add a small container of Tylenol PM, cough drops and Tums to my personal kit that I bring into the tent with me at night. These are things that I might need in the night and I don't want to try searching through my first aid kit in the middle of the night. I also add aloe vera gel and/or burn medication to my kitchen kit so if I burn myself while cooking, I have it handy.
Things to remember when preparing your kit:
The environmental extremes you'll encounter on your trip - altitude, cold and heat
Number of people and any pre-existing conditions within your group
Number of days the kit will be in use
The distance from medical care
Your own and the group's medical expertise
Choose items for your kit that are multi-purpose and versatile
Check your kit prior to every outing - make sure medications haven't expired and everything is intact. Leave out items that may be unnecessary for that particular trip
Become familiar with the proper uses of all items in your kit before you need to use them
Each member should carry a small personal kit
Suggestions
A full sized Sam Splint (for sprains and breaks) and Spenco Second Skin (for burns and blisters) are great additions to a first aid kit.