Dead Man's Blood
From the Pad of Definitions
A poison to vampires that incapacitates them for a short period of time. When the blood from a dead human is injected into a vampire it induces a blood sickness, causing them to become very weak.
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Interesting to note that Supernatural chose to disregard some myths about vampires but kept others. The method of incapacitating a vampire with blood from a dead person is part of the vampiric folklore. Tricking a vampire into drinking blood from a dead person to kill him has also been used quite a few times in vampiric tales. Oftenly too, the vampire must absolutely stop drinking the blood of her/his victim before she/he dies, as drinking blood after death is harmful to the vampire. The symbolic of blood is very strongly associated to life, so one can argue that drinking 'dead' blood is adverse to the vampire myth.
Neige 21:50, 12 September 2006 (PDT)