Mandrake
[ Mandragore ]
ingested (vegetal) - 300 gp
First of all a beneficial plant, in overdose the mandrake is a real poison with bitter taste.
A creature subjected to this poison must succeed on a DC 10 Constitution saving throw or be poisoned for 2d6 minutes. While poisoned, the creature's Wisdom score is temporarily reduced by 1d4 and suffers hallucinations.
Recueil des poisons d´Tapouweb