As a medical professional, I have a first aid kit that will prevent the need for many Emergency Department visits, but I would like to recommend a few items for others who may find themselves having a medical emergency in remote locations. The number one most potentially impactful medication (aside from an Epi-pen in acute allergic reaction) you should carry is the lowly common aspirin. In the event of a heart attack or any suspected acute cardiac event, aspirin is the one medication we give that actually improves outcomes in the vast majority of patients, and the earlier it is given improves its effectiveness. With that said, there are a few situations in which it may be contraindicated, so check with your physician BEFORE a big trip to see whether or not you could fall into this category. FYI aspirin is NOT indicated to alleviate chest discomfort, but rather to prevent platelets from clumping together and forming blood clots that can clog small arteries.
In addition, be sure to carry extra prescription medications in case an unexpected emergency prevents you from returning home in a timely fashion, minor wound care supplies, including butterfly closure strips, as well as a few otc medications for digestive issues that could ruin a trip (think anti-diarrhea, antacids, or anti-nausea). Having a current list of your medical conditions, prescriptions, and emergency contacts that is readily accessible can help any emergency providers who might respond in the event you cannot speak for yourself.
Know the signs of heart attack and stroke. These are time-sensitive events in which EARLY intervention can make all the difference in both survival and ultimate quality of life. Experiencing a medical emergency while on the road can be potentially devastating, but a little preparation and knowledge can help make a terrible situation better.