It appears that bloodletting has no effect on poison, even when receiving the "strong leeches" echo suggesting a successful attempt. No change in damage verb from the poison, poison duration, or poison effect (-5 str). The only notable change is the damage from the skill itself and the -con affect of the skill.


LOG BELOW:

You are affected by:
Skill: 'bark skin' modifies armor class by -36 for 12 hours.
Skill: 'poison' modifies strength by -5 for 6 hours.
Skill: 'warcry' modifies save vs spell by -6 for 4 hours.
Skill: 'warcry' modifies hit roll by 3 for 4 hours.

XXXXXXXXXXXX (wilderness SWAMP/12 PM/standing)

You shiver and suffer.
You step out from your cover.
Your poison devastates you!

XXXXXXXXXXXX (wilderness SWAMP/1 PM/standing) bloodlet

XXXXXXXXXXXX (wilderness SWAMP/1 PM/standing) You scrounge some leeches from the surrounding swamp, and place them on your flesh.
The leeches were strong, and consumed much of the bad blood. You feel somewhat better.
Your bloodletting devastates you!

XXXXXXXXXXXX (wilderness SWAMP/1 PM/standing) af
You are affected by:
Skill: 'bark skin' modifies armor class by -36 for 11 hours.
Physical effect: 'bloodletting' modifies constitution by -2 for 8 hours.
Skill: 'poison' modifies strength by -5 for 5 hours.
Skill: 'warcry' modifies save vs spell by -6 for 3 hours.
Skill: 'warcry' modifies hit roll by 3 for 3 hours.
Skill: 'herbs' for 2 hours.


XXXXXXXXXXXX (wilderness SWAMP/1 PM/standing)
You shiver and suffer.
Your poison devastates you!

It can make the poison easier to cure (not something you'll notice via damage/AF).