The blood shield is a tribal remedy for dealing with poison. The draught will simultaneously heal you and boost your ability to resist being poisoned from all sources (be it animals, poisoned melee weapons, or even eating a sacred datura root).
Effects of Medicine skill
|10||+4 Hit Point, +60 Poison resistance||60||+8 Hit Point, +110 Poison resistance|
|20||+5 Hit Point, +70 Poison resistance||70||+9 Hit Point, +120 Poison resistance|
|30||+6 Hit Point, +80 Poison resistance||80||+10 Hit Point, +130 Poison resistance|
|40||+7 Hit Point, +90 Poison resistance||90||+11 Hit Point, +140 Poison resistance|
|50||+8 Hit Point, +100 Poison resistance||100||+12 Hit Point, +150 Poison resistance|