About 6 percent of Americans have used methamphetamine recreationally. What's the real deal with meth? Methamphetamine, also known as meth or ice, is a man-made central nervous system stimulant. The drug is available by prescription for treating ADD, extreme obesity, and the sleep disorder, narcolepsy. Meth can be distributed illegally in a number of preparations, and can be injected, snorted, smoked, or swallowed. Immediately after taking meth, you'll feel extreme euphoria and a height in your libido. You'll experience a seemingly boundless burst of energy accompanied by a severe decrease in the need to eat or sleep. Many users report a fascination with repetitive tasks, and some mention feeling as if bugs are crawling on their skin. The long term effects associated with meth use include rapid tooth decay, or "meth mouth," brain damage, long-term paranoia, and psychosis. Remember that methamphetamine is illegal in the United States when prescribed.