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From Pathfinder Adventure: Troubles in Otari, which isn't enabled.

Antivenom Potion

ITEM 2
Price 6 gp
Usage held in 1 hand
Bulk L
Category potion

This cloudy, white liquid helps protect against poisons. When you drink an antivenom potion, you can immediately attempt a DC 10 flat check to end any persistent poison damage you're taking. In addition, for 1 minute after drinking the potion, you gain a +1 bonus to Fortitude saving throws to avoid taking persistent poison damage.

Pathfinder Adventure: Troubles in OtariOGL