Overdose causes vomiting. Severe overdose interferes with heart and causes death. Naturally occurring in several plants including belladonna and henbane. Can be administered internally as well as externally. Tiny amounts can be used to treat anxiety or motion sickness.
Death is when the heart is affected.
Scully described it as an anaesthetic which, in large quantities, is a hallucinogenic and has been used by kidnappers to subdue their victims. She also said it is a controlled substance, only obtainable by doctors. Strychnine Derived from a berry. Colourless solution with a very bitter taste, noticeable even in very weak solutions. 100 milligrams is always fatal, though much smaller doses have killed within 20 minutes.