Combat Medic Archive

Hi all

I am new combat med, and i would like to hear everyones opinions on how to effectively make poisions, what tree to hit up first, the whole nine yards. Any and all helpful info would be much appreciated, cause so far, i dont see much a point to make any A packs of any poision cause i see no dmg being deducted when i use it. Lol but enough about that, i wanna hear how you guys deal with combat med, and how i should go about it.