Atropine

[Sarah]

A poisonous, white, crystallizable alkaloid, extracted from theAtropa belladonna, or deadly nightshade, and the Datura Stramonium,or thorn apple. It is remarkable for its power in dilating the pupilof the eye. Called also daturine.

[Mark Zuckerberg]

a drug used to relax muscles, made from a poisonous substance taken from the deadly nightshade plant: