Methamphetamines are powerful, highly addictive stimulants that affect the central nervous system. They are chemically similar to amphetamine, a drug used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy. Methamphetamines can be found in various forms, including powder, crystal, and pills, and are often smoked, snorted, or injected. The use of methamphetamines can lead to severe health issues, including heart problems, dental issues often referred to as "meth mouth," and mental health disorders. Long-term use can result in addiction, causing significant changes in behavior and brain function. Treatment for addiction typically involves counseling and support.