Cococo Tonic

Made from an exotic plant of the New World, the Cococo Tonic really seems to work and variations of it can be found in many of the herbariums and quack houses of the Empire. One dose of this brown, sweet liquid taken during an illness can be enough to suppress the effects for an entire day.

Source
pg. 20
 * Warhammer Fantasy RPG 3rd ED -- Book of Plague