Fallout 4: Medic Perk

Boosting Healing with Stimpaks and RadAway

The Medic Perk makes Stimpaks and RadAway much more potent, helping to recover your character's health and restore their maximum life after having taken a lot of Radiation damage. Here are the four ranks of Medic, what it does for your character along with level requirements and PerkIDs:

Gameplay Effects & Utility
To speak of how useful the Medic Perk is in Fallout 4, we must first understand the two basic items it boosts and the stats they effect. Stimpaks normally restore 30% of lost health, and the further in the game you get the more you need them to recover substantial amounts of HP, since food offers flat amounts of healing. The second rank in this doubles the effect of a Stimpak, so it's a big leap in terms of healing potential. This one jump is more point-efficient than any of the others - you go from 30 to 60 in 2 points, then gain 20% each with the last two.

RadAway removes 300 points of Radiation damage. Radiation is a different system altogether. Your maximum HP will decrease, but one point of radiation does not equal 1 point of HP - 10 do. If half your bar is full, you've taken 500 radiation damage. A character can take 1,000 Radiation damage regardless of HP, and every 10 points reduces HP by 1%.

With just one point in Medic you will remove all Radiation with up to 40% of the bar filled. Thankfully, it doesn't remove only 40% of existing Radiation Damage you've taken, that would be a nerf to RadAway. It will restore 40% of the health bar's worth of Radiation. This '40%' makes RadAway do 400 points instead of 300, and the second point will do 600 points.

My recommendation is that you take two points in this at some point in your play, so long as you do not have an overabundance of Stimpaks and find yourself using them frequently. Later consider taking the last two when the more useful Perks aren't begging to be taken. The last rank does make the healing so fast that your character will not get to finish injecting themselves before your HP is restored. Despite this bonus, most players would not let their health get under 20% anyway, nor let 80% of their bar fill with Radiation damage so the last two ranks (mainly the last) of the Medic Perk is not as useful as the first two. Just in case the wording confuses you, no a RadAway will not also restore Health at Medic Rank 4, nor will a Stimpak reduce Radiation.

The bonus at Rank 4 is going to be more useful on Survival Difficulty, where healing is greatly slowed. It takes a full 60 seconds for multiple Stimpaks to take a character from 1-100% life without this Perk. With it, it's slashed in half to 30 seconds. On lesser difficulties, it takes a mere 2 seconds to heal to full vs ~4 seconds.