Methamphetamine comes in many different forms and is snorted, swallowed, injected, or smoked. Methamphetamine can cause lots of harmful things, including inability to sleep, paranoia, aggressiveness, and hallucinations. PDF for Mind Over Matter - Methamphetamine [PDF - 740 KB] The Brain's Response to Methamphetamine How Does Methamphetamine Cause Its Effects? Methamphetamine Changes the Brain Methamphetamine Has Lots of Other Effects What Happens If a Person Uses Methamphetamine for a Long Time? The Search Continues The Brain's Response to Methamphetamine › Español