Ideally you want to have had an Epi-Pen and Multivitamins too. The most important of these you want to always have on you are Bandages, Tetracycline Pills, and Charcoal Tablets.

Morphine Auto-Injector: Used when you have low health to negate some of the negatives effects for a brief time.

Best used when close to or already falling unconscious.

Epinephrine Auto-Injector: Used to reset your shock level.

Tetracycline Pills: Used as an antibiotic to treat most diseases.

Charcoal Tablets: Used to cure poisoning such as food poisoning or from drinking gasoline, alcoholic tincture, or disinfectant spray.

Codeine Pills: Used to treat pain from minor physical injuries.

Multivitamin Pills: Used to boost your immune system.

Saline Bag: Used to speed up natural blood recovery.To be used with a Blood Bag or Saline Bag. IV Starter Kit: Used to inject liquids into your body.Blood Collection Kit: Used to collect blood from yourself or another survivor which turns it into a Blood Bag for use later with an IV Starter Kit.Blood Test Kit: Used to determine what type of blood you have.Bandages: Used for bandaging wounds and to bleeding quicker than rags.These are the potential medical items you can find here and what they do:

No zombies in dayz standalone