Drug Harm Reduction Guide
IMPORTANT: This guide is for harm reduction and educational purposes only. If you or someone else is experiencing a medical emergency, call emergency services immediately (911 / 999 / 112). This resource does not encourage or endorse drug use. It provides evidence-based information to reduce the risk of serious harm.
Harm reduction is a public health philosophy that accepts that some people will use substances regardless of legal status, and seeks to reduce the associated risks without requiring abstinence. This approach is endorsed by organizations including the World Health Organization, the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), and DanceSafe.
// Core Harm Reduction Principles
Start Low, Go Slow
Always begin with the lowest possible dose of any substance, especially one you haven't used before or haven't used recently. Tolerance decreases rapidly during abstinence — a dose that was previously tolerated may be fatal after weeks without use.
Never Use Alone
If someone is present when an overdose occurs, they can call emergency services and administer naloxone (for opioids). If you must use alone, services like the Never Use Alone hotline (1-800-484-3731, US) will stay on the phone and call 911 if you become unresponsive.
Test Your Substances
Fentanyl and fentanyl analogues have been detected in virtually every drug category, including stimulants, pressed pills, and cannabis edibles. Use reagent test kits AND fentanyl test strips (FTS) for every unknown substance.
Avoid Mixing Substances
Combining CNS depressants (opioids + benzodiazepines + alcohol) is the most common polydrug overdose scenario and dramatically increases overdose risk. Stimulants do not "cancel out" depressants — they mask symptoms while the depressant effect continues.
// Overdose Recognition & Response
Opioid Overdose Signs
- Unresponsive / unconscious
- Slow, shallow, or stopped breathing
- Lips or fingernails turning blue (cyanosis)
- Gurgling or choking sounds
- Pinpoint pupils
- Limp body, pale/clammy skin
RESPONSE: Call 911 immediately. Administer naloxone (Narcan) if available — intranasal or IM. Place in recovery position. Repeat naloxone every 2-3 minutes if no response. Stay until emergency services arrive.
Stimulant Overdose Signs
- Chest pain, racing heart
- Severe agitation or psychosis
- Seizures
- High body temperature (hyperthermia)
- Stroke symptoms (face drooping, arm weakness)
- Loss of consciousness
RESPONSE: Call 911 immediately. Move to cool environment if overheated. Do not restrain forcibly. Do not administer sedatives unless medically directed. Monitor breathing until help arrives.
// Substance-Specific Information
MDMA (Ecstasy/Molly)
Test with Marquis (purple-black = MDMA), Mecke, and Mandelin reagents. Fentanyl test strips recommended. Stay hydrated but do not over-hydrate (1 pint/hour max). Take breaks from dancing. Avoid redosing. Do not mix with MAOIs (potentially fatal). Allow 1-3 month recovery periods between uses.
Cocaine
Test with Scott reagent. Fentanyl test strips are essential — fentanyl-adulterated cocaine is increasingly common and highly fatal. Avoid mixing with alcohol (produces cocaethylene). Cardiac risk increases significantly with combined use of stimulants and CNS stimulants.
Heroin / Opioids
Carry naloxone (Narcan) at all times. Use fentanyl test strips on every batch. Never use alone. Tolerance drops extremely rapidly during abstinence — previous doses can be fatal after as little as a week clean. Do not mix with benzodiazepines or alcohol.
Methamphetamine
Test for adulterants. Hyperthermia (overheating) is a primary cause of meth-related death. Stay in cool environments. Forced hydration during overheating is critical. Psychosis risk increases with sleep deprivation — sleep is the most effective intervention.
Benzodiazepines
Do not combine with other CNS depressants (alcohol, opioids, GHB). Physical dependence develops rapidly — withdrawal can be fatal and must be medically supervised. Taper slowly under medical guidance if dependent. Do not abruptly stop if physically dependent.
LSD / Psychedelics
Test with Ehrlich reagent (purple = present). Set and setting are critical. Have a trusted sober person available (tripsitter). Avoid in people with personal or family history of psychosis. Do not mix with lithium (seizure risk). Hydrate and avoid overheating.
GHB / GBL
GHB has an extremely narrow therapeutic window — small dose increases can shift from euphoria to unconsciousness. Never mix with alcohol (synergistic CNS depression, high overdose risk). Do not redose frequently. Time doses carefully. GBL converts to GHB — delayed onset leads to overdosing.
Cannabis
Start very low with edibles — onset can be 1-2 hours and effects much more intense than smoked. Hydrate. CBD can reduce anxiety from high-THC cannabis. If experiencing severe anxiety: move to a calm environment, lie down, remind yourself the experience is temporary. For cannabis use disorder: SAMHSA helpline.
Ketamine
Do not use alone (dissociation impairs self-rescue). Avoid mixing with CNS depressants. Bladder damage (ketamine cystitis) is a serious complication of frequent heavy use — characterized by severe pain on urination. Reduce use immediately if bladder symptoms develop.
Fentanyl & Analogues
Fentanyl is 50-100× stronger than morphine. Carfentanil is 100× stronger than fentanyl. Even skin contact with carfentanil can be dangerous. Fentanyl test strips detect most analogues. Naloxone may require multiple doses for fentanyl OD. This is the most dangerous adulterant in the current drug supply.
// Reagent Testing Guide
Reagent tests are chemical reactions that change color in the presence of specific compounds. They indicate presence, not purity — a positive test means the substance is present, not that the sample is safe or free of other compounds. Always use fentanyl test strips in addition to reagent tests.
| Reagent | Substance | Result Color |
|---|---|---|
| Marquis | MDMA | Purple → Black |
| Marquis | Amphetamines | Orange → Brown |
| Ehrlich | LSD / Indoles | Purple |
| Scott | Cocaine | Blue |
| Mecke | MDMA | Blue-Green → Black |
| Fröhde | Opioids | Various |
| Fentanyl Strip | Fentanyl / Analogues | 1 line = detected |
// Harm Reduction Resources
- DanceSafe — Drug checking, reagent kits, education
- TripSit — Drug combination safety checker
- EMCDDA — European harm reduction evidence base
- National Harm Reduction Coalition (US)
- SAMHSA National Helpline: 1-800-662-4357
- Never Use Alone Hotline: 1-800-484-3731
- StopOverdose.org — Naloxone training and distribution
- Reagent.me — Drug testing resources