SRD:Potion of Poison

Potion of Poison: This potion has lost its once beneficial magical abilities and has become a potent poison. The imbiber must make a DC 16 Fortitude save or take 1d10 points of Constitution damage. A minute later he must save again (DC 16) or take 1d10 points of Constitution damage.

Moderate conjuration; CL 12th; Craft Wondrous Item, poison; Price 5,000 gp.