What are they ?
Chemical variations of mescaline and amphetamine that have been synthesized for their feel good effects. 4-Methyl-2, 5-dimethoxyamphetamine (DOM) was introduced into the San Francisco drug scene in the late 1960s, and was nicknamed STP, an acronym for Serenity, Tranquility, and Peace. Doses of 1–3 milligrams generally produce mood alterations and minor perceptual alterations, while larger doses can produce pronounced hallucinations that last from 8–10 hours.

How are they used ?
The drugs are usually taken orally, sometimes snorted, and occasionally injected. Because they are produced in clandestine laboratories, they are seldom pure and the amount in a capsule or tablet is likely to vary considerably. These drugs are widely used at raves. (Raves are large all-night dance parties featuring computer-generated, high volume, pulsating music.)

Short Term Effects
These drugs differ from one another in their potency, speed of onset, duration of action and their capacity to modify mood with or without producing overt hallucinations.

Federal Classification
Schedule I