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1.
An adjective; mainly used to describe drugs that alter ones mental process or behavior.

Psychoactive drugs are usually catergorized into the groups of stimulants, depressants, hallucinogens, inhalants, anabolic steroids, narcotics, and some consider cannabis to be its own catergory. Cannabis can induce symptoms of every type of drug and its effects vary greatly in different people and during each ingestion.
THC, MDMA, LSD, Cocaine, PCP, Mescaline, Peyote, Methamphetamine, Alcohol and many other drugs are psychoactive.
by funny bunny August 03, 2005
 
2.
An amination product of safrol, a psychoactive oil found in nutmeg and related to the amphetamines.
Also known as Love Drug
methylene dioxy-amphetamine
Drug is similar in structure to amphetamines and mescaline.
The effects of MDA were accidentally discovered by G. Alles, the discoverer of amphetamine, who took 1.5 milligrams and saw illusionary smoke rings. Present-day researchers do not regard the drug as a hallucinogen, since subjects do not report hallucinations, visual distorsions, color enhancement, or mental imagery. Instead they experience intensification of feelings, greater desire to communicate, and heightened reflectiveness. The drug has been used in psychotherapy because it also induces age regression - a sense of reliving specific childhood experiences while remaining aware of one's present self. This effect has been induced with other hallucinogens, but with MDA it recurs so regularly and without prompting that it appears to be related to the pharmacology of the drug. Usual dosages are 150 to 200 milligrams and the effects wear off after seven or eight hours. MDA can be toxic, in dosages of varying amounts depending upon the individual's sensitivity to it. A regular dose for some may be fatal to others. Deaths have occurred after ingestion of MDA. Experimenters start with a low dose - e.g., 10 milligrams - and gradually increase it until toxic symptoms (skin reactions, profuse sweating, and confusion) appear
by tcheetchee September 03, 2004