Critical, being the way to restore lost HP.
You can use them in melee, forfeiting your attack. A stronger opponent'll stop you from using a dose half the time. Each does restores, say, no more than 20 HP at a time, so they may wear you down anyway.
|Name||List price?||Appraise?||Sell?||Per dose||Where|
|MedKit/25||6,250||5,000||3,250||200||Base, Freedom City, Death Warrior HQ, Widow Base, Frost Bite|
|MedKit/50||12,500||10,000||6,500||200||Base, Freedom City, Death Warrior HQ, Widow Base, Frost Bite|