Food and medication reactions are not something you want during a flight. It is, therefore, advisable to stick to what you know agrees with you before and during your flight. The last thing you, or the crew and other passengers, want is an allergic or adverse reaction which could cause the flight to divert in search of medical attention for a passenger. Airplanes are equipped with basic first aid kits and training. They are not equipped for medical emergencies. Even if there is a doctor on your flight, it’s no guarantee they will have what you need to properly alleviate your adverse reaction. If you do need to start a new medication, be sure to try it at home, well in advance of your flight. That way, if it needs to be adjusted or changed, you can do so in the comfort of your doctor’s office prior to your trip.