# Truth Serum *Adventuring gear, poison (ingested)* - **Properties**: [Poison](3-Mechanics/CLI/rules/item-properties.md#Poison) - **Cost**: 150 gp A creature subjected to Truth Serum must succeed on a DC 11 Constitution saving throw or have the [Poisoned](3-Mechanics/CLI/rules/conditions.md#Poisoned) condition for 1 hour. The [Poisoned](3-Mechanics/CLI/rules/conditions.md#Poisoned) creature can't knowingly communicate a lie. *Source: Dungeon Master's Guide (2024) p. 91*