morphine
analgesic
anodyne
opiate
pain pill
painkiller
apomorphine
amphetamine
arsenic
aspirin
barbiturate
belladonna
bisulphide
caffeine
calomel
chloral
chloroform
cocaine
curare
cyanide
digitalis
hyoscine
ipecac
laudanum
nicotine
opium
quinine
strychnia
strychnine
tannin