opiates are a certain type of drug, derived from the opium poppy.
oxy.
vicodin.
heroin.
are all opiates.
they are depressants or "downers".
"meth" is an amphetamine (methamphetamine)
ice.
shit.
speed.
tweak.
meth is a stimulant and is an upper.
cocaine is some weird sort of a...