Speed, meth, chalk, crystal, ice, glass. These are all names for the drug methamphetamine. Methamphetamine comes inmany different forms and is snorted, swallowed,injected, or smoked. They have discovered that even three years after long-time methamphetamine users had quit using the drug, their dopamine neurons were still damaged. Scientists don’t know yet whether this damage is permanent,but this research shows that changes in the brain from methamphetamine usecan last a long time. Research with animals has shown that the drug methamphetamine can also damage neurons that containserotonin. This damage also continues long after the drug use is stopped.