strychnia
strychnina
alkaloid
phytotoxin
plant toxin
arsenic
aspirin
atropine
belladonna
caffeine
calomel
chloral
chloroform
codeine
curare
cyanide
digitalis
hyoscine
laudanum
monoxide
morphia
narcotine
nicotine
penicillin
quinine
salicylate
succinylcholine
tellurium