Methamphetamine is a powerful, synthetic stimulant that directly affects the central nervous system. It is a man-made chemical, unlike cocaine, which comes from a plant.

Chemically, its structure is similar to amphetamine, a drug used to treat attention-deficit hyperactivity disorder (ADHD) and narcolepsy. However, small changes to its structure make it much more potent and harmful.

Like many molecules, methamphetamine exists in two mirror-image forms called enantiomers: dextromethamphetamine (d-methamphetamine) and levomethamphetamine (l-methamphetamine). The dextro form is a much stronger central nervous system stimulant, and it's the one most commonly abused.

On the street, methamphetamine goes by many names. The name often depends on its form and purity.

This powder form can be pressed into pills. Another common form is crystal methamphetamine, which looks like glass fragments or shiny, bluish-white rocks. Common nicknames include:

• Meth
• Crystal or Crystal Meth
• Ice
• Crank
• Speed

The way a person uses methamphetamine changes how quickly it affects the brain. The faster the drug enters the bloodstream and brain, the more intense the initial rush. This intensity is a major reason why the drug is so addictive.

Methamphetamine works by flooding the brain with dopamine, a chemical messenger associated with pleasure, motivation, and reward. This massive surge of dopamine is what causes the intense high.

This initial feeling of euphoria and energy is often followed by a harsh crash as the drug wears off. The immediate physical and psychological effects can be dramatic and dangerous.

Physiological Effects:

• Increased wakefulness and physical activity
• Decreased appetite
• Faster breathing
• Rapid or irregular heartbeat
• Increased blood pressure and body temperature

Psychological Effects:

• A powerful sense of euphoria or a "rush"
• Increased attention and alertness
• Irritability and restlessness
• Paranoia and anxiety

This overview provides a basic understanding of what methamphetamine is. Its chemical nature, methods of use, and immediate impact on the body all contribute to its high potential for addiction and harm.