Medic
Medics have Syringe gun, Bonesaw, and Medi gun.When medic use his Medi gun on a teammate, they will regain health points. Teammates who are already at full health will have their health buffed beyond the normal limit, up to 150% of their base health production. Teammates who have not taken damage recently will be healed more rapidly, encouraging smart withdrawals when low health.
When healing, the Medic will gradually fill a unique ÜberCharge bar, faster if healing injured teammates. When the ÜberCharge bar is fully charged, the Medic's healing gun will begin to crackle with small jolts of electricity, indicating that he can now deploy a unique charge to benefit his patient and himself for eight seconds.
Medic strategy
Use your Medi Gun to heal teammates, and buff them up to 150% of their normal health.
Fill your ÜberCharge by healing teammates. Then hit 'MOUSE2' to activate.
Your ÜberCharge makes both you and your Medi gun target invulnerable for a short time.
You fill your ÜberCharge faster by healing teammates who are more hurt.
Keep alert for teammates calling for your help. Use the Medic arrows onscreen to find them.
How to fight a medic
In any situation, your first target is the Medic. Unless he’s dead, any damage you do can be quickly healed away. He’s actually pretty fragile and goes down quite quickly. Classes that can should splash damage from their rockets and grenades to whittle down their health, even if they can’t be sure of a direct kill.
go to Team Fortress wiki to find more information.