Vigilance

Source Potions and Poisons pg. 27
Type ingested; Addiction moderate, Fortitude DC 20
Price 15 gp
Effect 1d3 hours; +10 alchemical bonus on Perception checks
Effect 4 hours; user is denied his Dexterity bonus to AC
Damage 1d4 Con damage
Scholars and students are often willing to accept the clumsiness and slow reactions in exchange for the benefits gained in research and study from this bitter white powder.