Truth Serum

Ingested

A creature subjected to this poison must succeed on a DC 11 Constitution saving throw or become poisoned for 1 hour. The poisoned creature can’t knowingly speak a lie, as if under the effect of a zone of truth spell.

Ingested Poison, 150 GP

A creature subjected to Truth Serum must succeed on a DC 11 Constitution saving throw or have the Poisoned condition for 1 hour. The Poisoned creature can’t knowingly communicate a lie.