Methamphetamine

A powerful CNS stimulant that dramatically increases dopamine, norepinephrine, and serotonin release. In chemsex (often called 'PnP' — party and play), meth is used for its prolonged euphoria, dramatically increased libido, enhanced stamina, and lowered inhibitions. Sessions can last hours to days.

How It Works

Methamphetamine enters neurons and reverses the dopamine, norepinephrine, and serotonin transporters, causing massive release of these neurotransmitters. Also inhibits monoamine oxidase. The result is a massive, sustained flood of stimulatory neurotransmitters far beyond what any natural stimulus produces.

Legal Status

Schedule II in the US (Desoxyn is prescribed for ADHD/obesity, but rarely). Illegal in most jurisdictions worldwide. Class A in UK.

Dosage Guide (Smoked/Insufflated)

Note: Street meth purity varies enormously. There is no safe dose of methamphetamine for recreational use. These ranges are from pharmacological literature. Start extremely low if you choose to use.

Organ System Impacts

neurological — Dangerous

Neurotoxic — damages dopamine and serotonin neurons. Chronic use causes lasting changes to brain structure and function. Memory impairment, cognitive deficits, emotional dysregulation. Psychosis risk increases with use duration and sleep deprivation.

cardiovascular — Dangerous

Dramatically increases heart rate and blood pressure. Causes vasoconstriction. Cardiomyopathy with chronic use. Arrhythmias. Heart attack and stroke risk even in young, healthy users.

dermatological — Moderate

Vasoconstriction reduces skin blood flow. 'Meth sores' from compulsive skin picking (formication — sensation of insects under skin). Accelerated skin aging with chronic use.

hepatic — Moderate

Hepatotoxic, especially with high doses or chronic use. Liver metabolizes meth and its metabolites. Hyperthermic episodes can cause acute liver damage.

renal — Moderate

Dehydration plus vasoconstriction stresses kidneys. Rhabdomyolysis (from extreme activity or hyperthermia) can cause acute kidney failure.

respiratory — Moderate

Smoking causes direct lung damage. Bronchospasm possible. Pulmonary hypertension with chronic use. IV use carries risk of pulmonary embolism.

gastrointestinal — Moderate

Appetite suppression leading to malnutrition. Vasoconstriction can cause ischemic bowel. Rectal administration damages tissue.

musculoskeletal — Moderate

Bruxism causes dental damage. Muscle tension and cramping. Rhabdomyolysis possible during extreme exertion or hyperthermia.

ocular — Low

Dilated pupils (mydriasis). Dry eyes. Blurred vision at high doses.

hematological — Low

No major direct hematological effects. IV use risks blood-borne infections.

Effects

Desired Effects

• Intense euphoria
• Dramatically increased libido and sexual stamina
• Extreme energy and wakefulness
• Increased confidence and sociability
• Enhanced focus and motivation
• Reduced inhibitions
• Feelings of power and invincibility

Negative Effects

• Jaw clenching and teeth grinding (bruxism)
• Anxiety, paranoia, and agitation
• Insomnia (inability to sleep for days)
• Dehydration
• Erectile dysfunction (paradoxically, despite increased libido)
• Compulsive redosing
• Impaired judgment leading to risky sexual behavior
• Crash/comedown: severe depression, fatigue, anhedonia

Rare but Serious

• Stimulant psychosis (paranoid hallucinations, delusions — especially after sleep deprivation)
• Serotonin syndrome (especially if combined with other serotonergic drugs)
• Cardiovascular crisis: heart attack, stroke, aortic dissection
• Hyperthermia (potentially fatal overheating)
• Seizures
• Rhabdomyolysis (muscle breakdown)
• Sudden cardiac death

Drug Interactions

Detection Times

Methamphetamine is detectable on standard drug panels and has a moderate detection window.

Urine

Standard immunoassay panels detect amphetamines/methamphetamine. Detection window: up to 5 days.

Blood

Detectable in blood for 1-3 days after use. Detection window: up to 3 days.

Hair

Hair follicle test can detect use over months. Detection window: up to 90 days.

Saliva

Oral fluid testing detects recent use. Detection window: up to 3 days.

Harm Reduction Tips

• Hydrate, but don't overhydrate. Sip water regularly.

• If smoking: use a clean pipe, avoid burned or overheated hits

• PnP sessions that last days are extremely dangerous — set a hard time limit and stick to it

• Sleep deprivation dramatically increases psychosis risk. If you've been up 24+ hours, stop.

• Eat before and during — meth suppresses appetite but your body needs fuel

• Use condoms and PrEP — meth dramatically increases sexual risk-taking and HIV transmission

• Get tested for STIs regularly if you PnP

• If injecting (slamming): ALWAYS use new, sterile needles. Never share equipment. Access needle exchange.

• Have a sober friend or check-in buddy for PnP sessions

• Recognize compulsive redosing — if you can't stop dosing, the drug is driving, not you

• The comedown is not permanent — the depression and anhedonia will pass

• If you're using more than monthly, honestly assess whether your use is escalating

Withdrawal Symptoms

Severity: High

Crash phase: 1-3 days (sleep, hunger). Acute withdrawal: days 3-10 (depression, cravings peak). Protracted withdrawal: weeks to months (anhedonia, cravings, cognitive issues).

Physical

• Extreme fatigue and hypersomnia
• Increased appetite
• Psychomotor retardation
• Aches and pains
• Dry mouth

Psychological

• Severe depression (can include suicidal ideation)
• Anhedonia — inability to feel pleasure
• Intense cravings
• Anxiety and irritability
• Cognitive impairment — difficulty concentrating
• Vivid disturbing dreams

Emergency Information

Call 911 If:

• Chest pain that radiates to arm, jaw, or back (possible heart attack)
• Sudden severe headache or vision loss (possible stroke)
• Body temperature feels dangerously high and won't come down
• Seizures
• Paranoid psychosis — seeing/hearing things that aren't there, believing people are after you
• Loss of consciousness
• Signs of stroke: face drooping, arm weakness, speech difficulty

What To Do

1. Move to a cool, quiet environment
2. Sip cool water (not ice cold)
3. If overheating: remove excess clothing, apply cool (not cold) water to skin
4. If paranoid/psychotic: move to a safe, calm environment. Speak slowly and reassuringly.
5. Benzodiazepines (if available and prescribed) can help with agitation — but do NOT combine with other depressants without medical guidance
6. Do NOT take more meth to 'feel better'

What To Tell EMS

The patient used methamphetamine. Report route, approximate dose and timing, duration of binge if applicable, last time they slept, and any other substances taken. Key concerns: hyperthermia, cardiac events, psychosis, rhabdomyolysis.

Seek Help If

• Heart rate over 150bpm at rest
• Chest pain or pressure
• Severe anxiety or panic that won't subside
• Feeling overheated and unable to cool down
• Dark-colored urine (possible rhabdomyolysis)
• Haven't slept in 48+ hours and experiencing perceptual disturbances

Normal Discomfort

• Jaw clenching and teeth grinding
• Increased heart rate (under 120bpm at rest)
• Difficulty sleeping
• Reduced appetite
• Mild anxiety