Medicine FAQ:

• How do I heal?
  To restore HP to one of your limbs, hold down the "5" key on your keyboard. This will display a action wheel to heal your player. Once you select a medical item to use, it will begin the animation and use the item you selected. Once a medical items resources reach 0, you will no longer be able to use it and it will disappear form your inventory.
  
• Can I find medical items in raid easily?
  Medical items in Delta Force are not impossible to find in raid. You may get lucky when looting and find the medkit you need; however, it is not ideal to rely on. It's best to bring a backup medkit if you think you may run out of medical supplies.
• Should I be healing mid-fight? If not, when?
  Healing in the middle of an active engagement can be extremely dangerous, but also necessary. Only use a medkit in a close-range fight if it is absolutely necessary. If you are involved in an engagement at range, you should be safe to use a medkit.
• Is it ok to not be full HP after an engagement?
  Short answer, yes. When outside of an active engagement, you should prioritize healing over looting, unless you need to GTFO. As long as you don't have any active HP or movement draining statuses, you should be safe to leave the area. Just remember that if you are 75% HP or below, you are in no condition to engage in a new firefight. So choose your battles carefully and always try to remain full HP.