What It Is: Methamphetamines are stimulants, a type of drug that lets people stay awake and do continuous activity with less need for sleep. These drugs are made as pills, powders, or chunky crystals called ice. Ice, nicknamed crystal meth, is a popular drug, especially with young adults and for those who go to lots of dance clubs and parties. Sometimes Called: speed, uppers, meth, crystal meth, chalk, ice, glass, Christmas tree, crank (especially when injected) How It's Used: Methamphetamines are swallowed, inhaled, smoked, or injected into a vein. What It Does: Swallowed or snorted (also called bumping) meth give the user an intense high. Injections create a quick but strong intense high, called a rush or a flash. People who abuse methamphetamines feel high and full of energy. They think the drug will allow their bodies to keep going and going. But meth is very damaging to the body and brain, especially with repeated use. Side effects include rapid breathing, an irregular heart rate, and increased blood pressure. Users also complain of sweating, headaches, blurred vision, dry mouth, hot flashes, and dizziness. Because the drug often decreases or even eliminates appetite, it has been used as a dangerous dieting strategy for people trying to lose weight quickly. "Meth mouth" is another risk. This severe tooth decay and gum disease often causes teeth to break or fall out. Long-term use can bring on brain damage that causes problems with memory and body movements, and can cause mood swings and violent behavior. When used in larger doses, meth can cause dangerously high body temperature, confusion, convulsions (uncontrollable jerking body movements), and even death. Back to Articles Related Articles Drugs: What to Know It's not hard to find drugs, and sometimes it may seem like everyone's doing them or wanting you to do them. But there are downsides (and dangers) to taking drugs. Read More Dealing With Addiction Find out what you can do if you think you or a friend has a drug or alcohol addiction - from recognizing the warning signs to suggestions to help you stay clean. Read More Bath Salts Bath salts are powerful stimulant drugs that increase brain and central nervous system activity. Find out how they can affect you in this article for teens. Read More Cocaine Cocaine is a powerful and highly addictive stimulant drug. Find out more about cocaine and its effects. Read More Amphetamines Amphetamines are stimulants that speed up brain and body functions. Find out how these drugs can affect you in this article for teens. Read More Ketamine Ketamine is a fast-acting and powerful anesthetic that is often used as a date rape drug. Find out more in this article for teens. Read More School Counselors School counselors can give you all sorts of tips and support on solving problems and making good decisions. But how do you meet with a counselor and what is it like? Find out here. Read More Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.