CYCLING PERFORMANCE TIPS
It's likely it will remain unused, but if you do experience a problem (and they usually pop up at night when all the drug stores are closed) a few simple items can save a lot of aggravation.
General hygiene - This is really common sense, taken for granted when we are at home, but often forgotten when we are traveling. Always pay attention to the source of that water you are drinking and wash your hands before eating or preparing food.
Vaccinations - tetanus is really the only one (and an essential one if you spend a lot of time outdoors) for the US. For an over seas trips, you can find the most complete list of recommended vaccinations on the CDC (Centers for Disease Control) website.Medical Insurance/Evacuation Insurance - this coverage is generally part of any travel insurance you might have purchased for a longer trips). For my own piece of mind (I travel a lot as well as do many 2 and 3 day rides away from home) I have an annual policy through Diver's Alert Network (DAN).
General first aid items:
(and as a bonus, they are great for removing that tiny piece of wire out of your tire)
If you are flying, take the medical kit in your carry on. Replacing a complete kit which is in your missing or delayed luggage would be hard to replace in a strange city or country.
Here is what I, as a physician, use as a starting point to build a fist aid kit, modified depending on the type and length of the planned trip.