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Substance education guide

Methamphetamine (Crystal Meth)

Synthetic substituted phenethylamine · Potent Schedule II CNS stimulant

Representative photo of Methamphetamine (Crystal Meth)What it looks like
Image: DMTrott · CC BY-SA 4.0 · Wikimedia Commons. Appearance varies; illicit products may look different or be counterfeit.

01 · How it works

Classification and primary mechanism

Methamphetamine enters presynaptic dopamine, norepinephrine, and serotonin neurons through DAT, NET, and SERT. It inhibits VMAT2, collapses vesicular monoamine gradients, and reverses DAT and NET to flood the synaptic cleft with monoamines. Its added methyl group increases lipid solubility, allowing faster blood-brain-barrier penetration and greater resistance to monoamine oxidase degradation than amphetamine.

02 · Immediate effects

Recognize the effects

Signs of Use

  • Marked alertness, pressured speech, and motor hyperactivity
  • Dilated pupils, sweating, jaw clenching, and severe appetite suppression
  • Rapid heart rate, acute hypertension, and elevated body temperature
  • Paranoia, tactile hallucinations, agitation, or repetitive behavior
  • Chest pain, seizure, collapse, or inability to stay awake

Short Term

  • Low to moderate: euphoria, grandiosity, hyper-vigilance, continuous speech, and increased activity
  • Physiologic activation: tachycardia, hypertension, sweating, hyperthermia, appetite suppression, and insomnia
  • High or repeated exposure: agitation, paranoia, hallucinations, repetitive movements, and impaired judgment
  • Severe toxicity: stroke, myocardial infarction, seizure, rhabdomyolysis, hyperthermia, or cardiac arrest
  • After-effects may include exhaustion, depressed mood, anxiety, and prolonged sleep disruption

Long Term

  • Methamphetamine use disorder, tolerance, craving, and compulsive redosing
  • Persistent anxiety, depression, insomnia, and cognitive or memory changes
  • Chronic paranoid psychosis or stimulant-induced mania
  • Cardiomyopathy, coronary disease, stroke, and dental destruction
  • Skin injury, malnutrition, infectious harms, and brain injury from repeated hyperthermia

03 · Long-term consequences

Cardiovascular toxicity and psychosis

Desoxyn is a rare Schedule II prescription for severe ADHD or narcolepsy, but illicit crystal meth dominates the unregulated supply. It may appear as translucent shards, off-white powder, or counterfeit tablets and can be contaminated with fentanyl or other stimulants. There is no reliable way to identify strength or contents by appearance.

Medical emergency

Identifying an emergency

Call 911 for chest pain, severe headache, one-sided weakness, seizure, extreme agitation, dangerous confusion, high temperature, collapse, or trouble breathing. Reduce stimulation, move away from hazards, stay with the person, and provide rescue breathing or CPR if needed.

Never mix methamphetamine with other stimulants, serotonergic drugs, alcohol, or opioids; fentanyl-contaminated counterfeit tablets may require naloxone
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