From Brotato Wiki
Medikit
Item
Tier 4
Stats
+10 HP Regeneration
+2 HP Regeneration every 5 seconds until the end of the wave
-10 Luck
+2 HP Regeneration every 5 seconds until the end of the wave
-10 Luck
Price
95
Unlocked by
Win a run with 
Doctor
DoctorItem
Medikit is an in-game item that can be bought from a Shop or can be found in a Crate. Most Items modify the Stats of the player, and some of them provide additional effects.