When putting together a First Aid kit for a vehicle you do not only need the disposable medical items such as bandages and a selection of medications. There are also other items which can be very useful in the event of an accident or emergency when you are on the road.
Obviously a cell phone can be invaluable but ensure that it has a dashboard recharger. Also you need to keep a note of emergency numbers and contact information for your family doctor and pediatrician, for your roadside emergency service and the poison control center.
You should carry a small, waterproof flashlight with extra batteries and candles and matches in case you are our overnight and need to start a fire and candles for light. Still thinking of overnight, or if stranded in the snow or if someone is injured, it is useful to keep a Mylar emergency blanket in your car.
Sunscreen and insect repellent plus insect spray are worth having in the vehicle too, in case you need to hike for help.
You should check your first-aid kit regularly, at least every three months, to be sure the flashlight batteries work and to replace supplies that have past their expiration date or to replace those that have been used.
