a drug family is much more specific than drug class (i.e. stimulant, depressant, opiate, and hallucinogen) in that all drugs in a drug family affect the body in a similar manner through means of similar chemical structure. Examples of this include:

The Phenethylamine Family:
amphetamine, methamphetamine, ephedrine, MDMA (Ecstasy), MDA, MDE, Methylphenidate (Ritalin), 2C-B, 2C-T-7, mescaline

The Tryptamine Family:
DMT, 5-MeO-DMT, AMT, 5-MeO-AMT, psilocin, psilocybin (Mushrooms), bufotenine, LSD, LSA

The Cannabinoid Family:
THC (Marijuana), dronabinol (Marinol)
Marijuana is in the cannabinoid family.
by muchluv June 23, 2005
A 'family' of the 6 most common drugs.
Marijuana, Speed/Ice, LSD, Ecstacy, Cocaine and Heroin
"Have you done any drugs outside the immediate 'drug family'?" (ie. DMT, 5-Meo-Dit, Datura)
by Diego September 04, 2003

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