Drug Harm Reduction Guide
This is an evidence-based informational resource covering harm reduction practices for common substances. The goal is to reduce the risk of injury, overdose, and death associated with drug use. All content is sourced from public health organizations and peer-reviewed research.
Core Harm Reduction Principles
Begin with the smallest possible dose. Wait for full onset before considering re-dosing. Tolerance varies by individual, substance, and batch. This principle applies to all substances, especially those obtained from unregulated sources where potency cannot be confirmed.
Reagent test kits provide rapid chemical identification and detect adulterants. Fentanyl test strips are critical for any substance that may contain opioid adulterants. DanceSafe (dancesafe.org) provides testing resources. Test every batch from every source.
A trusted person nearby can respond to an overdose or medical emergency. If using alone is unavoidable, use the Never Use Alone hotline (1-800-484-3731, US) — a telephone service that stays on the line and calls emergency services if you become unresponsive.
Polydrug use dramatically increases risk. CNS depressant combinations — opioids + benzodiazepines + alcohol — account for the majority of overdose fatalities. Check interactions at TripSit Factsheets (tripsit.me) before combining any substances.
Naloxone (Narcan) reverses opioid overdose. It is available without prescription in most Canadian provinces and US states. Keep it accessible whenever opioids are present, even if opioids are not the primary substance being used.
Stimulants increase core temperature and dehydration risk. Stay hydrated — but not over-hydrated with MDMA (hyponatremia kills). Know your environment, have a trusted exit, and ensure ventilation for smoke or vapor exposure.
Overdose Recognition and Response
Opioid Overdose Recognition & Response
Signs: Slow, shallow, or stopped breathing; pinpoint pupils; blue or grey lips/fingertips (cyanosis); unresponsive; gurgling or choking sounds (death rattle).
Response Steps
- Try to rouse the person — sternal rub (knuckles on breastbone)
- Call 911 immediately — stay on the line. Good Samaritan laws protect callers in most Canadian provinces and many US states
- Administer naloxone: intranasal (Narcan nasal spray) — one spray in each nostril; OR intramuscular injection into the outer thigh
- Place in recovery position (on their side) if breathing — prevents choking
- If not breathing — begin rescue breathing (one breath every 5 seconds)
- Naloxone wears off in 30–90 minutes — stay with the person; second dose may be needed
- Do not leave the person alone until professional help arrives
Stimulant Overdose (Cocaine, Methamphetamine, Amphetamines)
Signs: Racing or irregular heartbeat; chest pain; very high temperature (hot, dry skin); extreme agitation or paranoia; seizures; loss of consciousness.
Response Steps
- Call 911 for chest pain, seizures, unconsciousness, or temperature above 40°C (104°F)
- Move to a cool environment — stimulant overdose can cause fatal hyperthermia
- Apply cool wet cloths to neck, armpits, and groin if overheated
- Keep the person calm and still — exertion worsens cardiac risk
- Do not restrain forcibly if aggressive — redirect and contain safely
- Recovery position if they lose consciousness and are breathing
- No antidote exists for stimulant overdose — supportive care is treatment
Benzodiazepine and Alcohol Overdose
Signs: Extreme sedation; confusion; slurred speech; loss of coordination; slow or stopped breathing; unresponsive; cold clammy skin.
Critical warning: Benzodiazepine + alcohol + opioid combinations are the leading cause of overdose death. Respiratory depression is additive. Naloxone does not reverse benzodiazepine or alcohol overdose — call 911.
- Call 911 for any unconscious or non-breathing person
- Recovery position if breathing to prevent aspiration of vomit
- Do not leave unattended — breathing can stop suddenly
- Keep warm — hypothermia is a risk with CNS depressant overdose
- Flumazenil (benzo antagonist) exists but is rarely available outside medical settings
Psychedelic Crisis (Difficult Trip / Psychological Emergency)
Psychedelics (LSD, psilocybin, DMT, mescaline) rarely cause physical overdose at common doses. The primary risk is psychological distress, panic, or erratic behavior leading to physical harm (falls, traffic). True physiological emergency is rare but possible with novel psychedelics or adulteration.
Response for Difficult Trip
- Create a calm, safe physical environment — low light, quiet, comfortable space
- A calm, trusted person should stay with them ("trip sitting")
- Grounding techniques: breathing exercises, cold water, physical contact (with consent)
- Do not leave them alone near heights, water, or traffic
- Benzodiazepines (diazepam) can reduce intensity if available — do not combine with other CNS depressants
- Fireside Project (1-623-473-7433, US) provides free support for psychedelic distress
- Call 911 if physical emergency, violence risk, or suspected adulteration with dangerous substances
General Emergency Response
- Assess responsiveness — speak loudly, tap shoulders
- Call emergency services — 911 (US/Canada), 999 (UK), 112 (EU)
- Airway — tilt head back, lift chin, check for breathing
- Breathing — if not breathing, begin CPR
- Recovery position — if breathing but unconscious, roll onto side
- Stay — do not leave the person until help arrives
- Inform paramedics — tell them what was taken if known; this helps treatment and does not waive Good Samaritan protections in most jurisdictions
Substance-Specific Harm Reduction
Cannabis / THC
High-potency concentrates and edibles can cause significant anxiety, panic, and temporary psychosis-like states. Edibles have delayed onset — do not re-dose early. CBD can moderate adverse THC effects. Not physically lethal at any known dose but psychological overdose is real. Avoid if personal or family history of psychotic disorders.
Opioids (Heroin, Fentanyl, Morphine, Oxycodone)
Highest overdose fatality risk. Any batch may contain fentanyl or carfentanil adulterants — test every batch. Never use alone. Always have naloxone. Avoid alcohol and benzodiazepines. Tolerance drops rapidly after any abstinence period — previous doses can be fatal after even a few days off.
MDMA
Test for MDMA vs methamphetamine vs alpha-PVP (Marquis reagent). Hyponatremia (water poisoning from over-hydration) and hyperthermia are the primary causes of MDMA-related death. Drink ~500ml water per hour during activity, not more. Dose spacing of 3+ months recommended for neurotoxicity reduction.
Cocaine
Cardiac and stroke risk is elevated — avoid with pre-existing heart conditions. Levamisole adulterant (present in most street cocaine) causes immune suppression with repeated use. Test strips can detect fentanyl adulteration in cocaine — a documented cause of overdose deaths. Avoid mixing with alcohol (cocaethylene formation increases cardiac risk).
Methamphetamine
High addiction potential. Hyperthermia, psychosis, and cardiovascular crisis are primary acute risks. Sleep deprivation compounds toxicity. Do not use around heights or machinery. Meth psychosis can persist days after last use. Long-term recovery of dopamine function takes 1–2 years of abstinence.
LSD / Psilocybin
Physiologically safe in healthy individuals with no contraindicated medications. Primary risks: psychological destabilization in susceptible individuals, HPPD (rare), dangerous behavior while disoriented. Contraindicated with lithium (risk of seizures) and MAOIs. Set and setting dramatically affect experience quality and safety.
Benzodiazepines
Physical dependence develops within 2–4 weeks of daily use. Abrupt cessation can be fatal (seizures) — benzodiazepine and alcohol are the primary drug classes where withdrawal can kill. Taper slowly under medical supervision if dependent. Never combine with opioids or alcohol.
Ketamine
Dissociative anesthetic. Risk of "k-hole" (extreme dissociation) at higher doses — ensure safe, supervised environment. Bladder damage (ketamine cystopathy) with frequent use — irreversible in advanced cases. Do not use around water or heights. Not safe to drive under any residual influence.
GHB / GBL
Extremely narrow dosing window — the difference between a recreational dose and an overdose is small, and varies significantly between batches. Never mix with alcohol or other CNS depressants. GBL converts to GHB in the body and acts faster/more intensely. Physical dependence develops rapidly; withdrawal can be fatal.