Slang terms for methamphetamine include speed, meth, chalk, ice, crystal and glass.
Methadone used in opiate maintenance therapy was originally developed to help obliterate withdrawal symptoms and support a healthy lifestyle. However, the effects of withdrawal far exceed that of heroin which causes the individual to become addicted to it instead.
The euphoria from amphetamines often doesn't last very long and individuals soon experience an intense mental depression and fatigue.
More PCP users die from suicide while high on the drug than from any physiological effects on the central nervous system.