When SHTF doctors, nurses, and other medical personal may be hard to find unless you have one in your family. A good first aid kit and first aid classes will help you handle most medical problems.
The Red Cross has a very good first aid book that everyone should have on hand. I have four copies of it myself. There's one in the house, one in my bug out bag, and one in each car.
There are a lot of good lists on the net that provide detailed lists of what you should have in your first aid kit. Since I'm not an expert I won't try to give you a list but will tell you that fanny packs work great for a small first aid kit and the big lure boxes that fishermen use are wonderful for a large first aid kit.
Some injuries like cuts and scratches will require basic first aid but what about sprains, broken legs and more severe injuries? It doesn't hurt to have medical equipment on hand that can be used when someone can't get around on their own. Crutches, adult potty chairs, wheel chairs, and other medical equipment that can be bought fairly cheap at yard sales and thrift stores are a good investment in prepping for your families needs in the future.
I have two pairs of crutches stored, one set for adults and one set for children.
I also have an adult bedside potty chair, an adult walker, adult diapers, bed mats, urinals, and braces for arms, hands, and feet. It may sound like overkill to have all this stored but when SHTF and someone gets hurt bad enough to need any of this I'll be glad I have it.
Prepping Granny