I've perused through the manual and can't figure out how to use medical packs to regain health. There was an on-screen tip, that I missed, that I think explained how. (I feel dumb for asking.)
Mass-effect – How to use Medical Packs/Regain Health
mass-effect-3
Related Solutions
Modifying your weapon is a bit of a convoluted process.
First, you need both a modifiable weapon, and a weapon mod. For instance, you can only stick an SMG mod on an SMG - no SMG means you can't use the mod at all.
Second, you need to find a weapon bench, or go to the armory on the Normandy and use that.
From here, simply click the appropriate weapon class, and then the red "Modify" button.
Next, you want to select one of the two mod slots. Note the counter here. If the number is 0/0, that means you have no available weapon mods (at least for this weapon). Pressing the left/right arrow will let you browse through available mods, and the up/down arrow will move between the two mod slots.
Simply manipulate these two arrows until you've got what you want, and then press "Confirm" on the lower left.
Ta da! Brand swanky new gun!
The website RarityGuide.com has compiled a list of tip texts shown during level screens for players with high-performance such as yourself. Follow this link to access the list.
Here are some examples of the listed tips:
Shepard's current health bar will regenerate, but already-depleted segments can only be restored by using First Aid from the Power Wheel.
Carrying too many weapons will increase cooldown, effectively slowing down how often you can use powers.
The Widow, Black Widow, and Javelin weapons can fire through enemies and light cover. Mod other weapons, like the Mattock and Claymore, to apply this devastating effect.
Heavy Melee is an effective attack against unarmored or unshielded enemies
Use the First Aid power to resuscitate a fallen squadmate from a distance. This consumes medi-gel. Move to your comrade to resuscitate them without using medi-gel.
Use hard-hitting weapons against armored opponents. Incendiary and armor-piercing ammo also help.
When a Ravager's sac breaks, Swarmers are released. Swarmers are weak, but a group of them can kill or keep shields from regenerating.
Cannibals form armored plating by reclaiming fallen Cannibals and Husks. Shooting these plates deal no damage to the Cannibal until they are blown off
Weapons have thermal clips to prevent overheating. Clips use a universal design, so retrieve compatible clips from combat areas and fallen enemies.
Source: RarityGuide.com
Best Answer
Shepard can fully restore his health by using Unity. In this iteration, it is a combination of Unity (From the previous two games) and the First Aid skill from Mass Effect the first.
Extra medi-gel now gives experience instead of credits, so there's no reason to be stingy.
The other big difference is that you do not have to use Unity to revive your squadmates - if you get to their position, you can revive them manually without expending medigel.
Finally, if Shepard has lost less than a full section of health, it will recover to full when his shields do, but this will never go beyond the current health pip.