an offhand reference to "contemporary historians of medieval pharmacological traditions"
followed up by this list:
henbane (of the nightshade family)
stramonium (thorn apple)
belladonna
mandrake
"extracts of such plants as the poppy (source of opium, heroin, and morphine) and hemp (marijuana, hashish)"
toads
"flour of damp cereals" ("probably having to do with the ergot fungus that attacks rye and from which LSD would be extracted")