Medicine

Medicine abilities let you heal yourself and others. Most require you to have medkits, so stock up on them at stores. Medkits and bandages are good for keeping your allies healthy if you have a large team, so Medicine pairs well with the Charisma ability. -the player's manual
(5) Bandage: You can use a rag as a bandage on yourself or another. Rags will restore 4 points of health. The amount increases with a higher Medicine skill.
(10) Medkit Efficiency: This ability will double the health bonus when you use a medkit on yourself or another, from 10 to 20. This is a passive ability.
(20) Pharmaceuticals: Using a medkit on yourself or another will completely eliminate poison. With 30 Medicine skill, it will also treat viral diseases. With 40 Medicine skill, radiation is also treated. This is a passive ability.
(30) Painkillers: Using a medkit on yourself or another will give a temporary +25% bonus to melee and bullet resistance. The amount increases with a higher Medicine skill. This is a passive ability
(40) Immunization: You are immune to viral diseases. With 50 Medicine skill, this ability also allows you to immunize others using a med kit. This is a passive ability.
(50) Medkit Mastery: This ability will triple the health bonus when you use a med kit on yourself or another, from 10 to 30. If you also know the Medkit Efficiency ability, then the bonus will quadruple to 40. This is a passive ability.
(all from the players manual)