Nexus Website — Harm Reduction Resource
What Is Harm Reduction and Why Does It Matter?
Harm reduction is a public health framework that accepts drug use as a social reality and focuses on reducing associated risks rather than enforcing abstinence. Organisations including the World Health Organization, Drug Policy Alliance, and National Harm Reduction Coalition support evidence-based harm reduction as a critical component of public health policy. The Nexus Website provides this documentation for informational purposes only.
Core Harm Reduction Principles
- Always test substances with reagent kits before consumption — fentanyl contamination is documented across multiple drug categories
- Start with the lowest possible dose when trying any new substance or new batch
- Never use alone — have a sober or aware person present
- Avoid combining CNS depressants (opioids + benzodiazepines + alcohol = high overdose risk)
- Keep naloxone (Narcan) accessible whenever opioids are involved
- Stay hydrated — but avoid over-hydration with MDMA (hyponatraemia is a documented cause of death)
Essential Testing Resources
Non-profit providing drug checking services at events and selling reagent testing kits. Publishes evidence-based harm reduction guides for most common substances.
Mandelin, Mecke, Marquis, Simon's, Froehde, and fentanyl strip tests cover most common substances. Combined test kits provide broader coverage.
Fentanyl is detected in increasing proportions of non-opioid samples including methamphetamine, cocaine, and MDMA. Test strips are low cost and effective for detecting fentanyl presence.
What to Do in an Overdose Emergency
Opioid Overdose Response
Opioid overdose is characterised by unresponsiveness or extreme sedation, slow, shallow, or absent breathing, blue-tinted lips or fingertips (cyanosis), and pinpoint pupils. Opioid overdose is a medical emergency with a narrow time window.
- Step 1: Call emergency services immediately (999/911/112)
- Step 2: Administer naloxone (Narcan) if available — intranasal or intramuscular
- Step 3: If not breathing, start rescue breathing (30 chest compressions : 2 breaths)
- Step 4: Place in recovery position (on side) to prevent aspiration
- Step 5: Naloxone wears off in 30–90 minutes — stay until emergency services arrive; re-dose if overdose returns
Naloxone is available without prescription at pharmacies in many jurisdictions. NEXT Distro provides free naloxone mail distribution in the US.
Stimulant Overdose Response
Stimulant overdose (cocaine, methamphetamine, MDMA, amphetamine) presents differently: chest pain, seizures, extreme hyperthermia (high body temperature), agitation, and in severe cases cardiac arrest.
- Hyperthermia: Move to a cool environment, apply cool damp cloths, offer water if conscious
- Chest pain: Call emergency services immediately — possible cardiac event
- Seizures: Do not restrain. Clear area of hazards. Time the seizure. Stay until it passes
- Cardiac arrest: Start CPR immediately (30:2 compressions to breaths) and call emergency services
Serotonin Syndrome (MDMA)
Serotonin syndrome from MDMA or combination use presents as: agitation, confusion, rapid heart rate, dilated pupils, muscle twitching, and high temperature. It can be fatal. Call emergency services if serotonin syndrome is suspected.
Substance-Specific Harm Reduction Guidance
Opioids (Heroin, Fentanyl, Oxycodone, etc.)
- Always test for fentanyl contamination — fentanyl is active at microgram doses
- Never use alone — call 1-800-484-3731 (Never Use Alone hotline) to stay on the phone
- Start with a test dose significantly smaller than usual, especially with a new supply
- Do not mix with alcohol, benzodiazepines, or other CNS depressants
- Keep naloxone available and ensure someone present knows how to use it
- Use clean equipment every time to prevent blood-borne infection transmission
MDMA (Ecstasy / Molly)
- Test with Marquis, Simon's, and Mecke reagents to confirm MDMA and rule out methamphetamine or cathinones
- Dose carefully: 75–120mg for most adults; avoid redosing more than once
- Drink 500ml of water per hour if dancing — do not over-hydrate (hyponatraemia risk)
- Do not combine with SSRIs (serotonin syndrome risk) or MAOIs
- Allow minimum 3-month gaps between uses to reduce neurotoxicity risk
- Overheating is a primary cause of MDMA deaths — cool down regularly
Cannabis (THC)
- High-potency concentrates and edibles have significantly different onset and duration profiles — start very low with edibles (2.5–5mg THC)
- Edibles take 30–120 minutes to take effect — do not redose before the first dose is felt
- THC-induced anxiety is common with high doses — move to a calm environment, breathe slowly
- CBD can reduce anxiety associated with THC — keep CBD on hand if prone to anxiety
- Synthetic cannabinoids (spice/K2) are dangerous and chemically different — avoid entirely
Stimulants (Cocaine, Methamphetamine, Amphetamine)
- Test cocaine for fentanyl and levamisole contamination
- Never combine with other stimulants or with MAOIs
- Methamphetamine: extremely high addiction potential — use is documented to cause significant neurological changes with repeated use
- Avoid using when alone, sleep-deprived, or under significant psychological stress
- Stimulant psychosis can develop with heavy use — paranoia and hallucinations are warning signs
- Cardiovascular risk is elevated significantly during stimulant use
Benzodiazepines (Xanax, Valium, Clonazepam)
- Never combine with opioids, alcohol, or other CNS depressants — this combination is responsible for a large proportion of overdose fatalities
- Benzodiazepine withdrawal is potentially life-threatening — do not stop suddenly after regular use without medical supervision
- Designer benzodiazepines (clonazolam, etizolam, etc.) have inconsistent potency and duration — extreme caution required
- Tolerance develops rapidly — increased doses cause increasing cognitive impairment
- If dependent, seek medical supervision for tapering (Ashton Protocol is publicly documented)
Psychedelics (LSD, Psilocybin, DMT, Mescaline)
- Test LSD with Ehrlich reagent — reacts purple/violet with indole compounds
- Set and setting are primary predictors of experience quality — ensure a safe, familiar environment
- Have a trusted, sober trip sitter present, especially for first experiences
- Do not combine with lithium (risk of seizures) or SSRIs/MAOIs
- Hallucinogen Persisting Perception Disorder (HPPD) is a documented risk with heavy use
- If experiencing a difficult experience: 5-HT2A antagonists (some antipsychotics) can reduce intensity — seek medical attention for a genuine crisis
Alcohol
- Alcohol is a CNS depressant — combining with opioids, benzodiazepines, or ketamine is highly dangerous
- Alcohol withdrawal is potentially fatal in heavy users — do not stop suddenly without medical support
- Blood alcohol level does not correlate reliably with perceived intoxication — do not judge impairment by subjective feeling
- Regular heavy use increases risk of liver disease, cardiomyopathy, and neurological damage
Dissociatives (Ketamine, PCP, DXM)
- Never combine with alcohol, opioids, or benzodiazepines — respiratory depression risk
- Ketamine bladder syndrome (ketamine cystopathy) develops with regular heavy use — bladder pain and damage requiring surgery in severe cases
- K-holes are dangerous if the user is in an unsafe physical environment — only use in a safe, stationary setting
- DXM is found in many OTC cough medications — other ingredients (paracetamol, antihistamines) are dangerous at DXM-dose quantities
Crisis and Support Resources
1-800-662-4357 — Free, confidential, 24/7 treatment referral and information service for individuals and families facing substance use disorders.
Publishes extensive evidence-based harm reduction guides for a wide range of substances. Training resources for naloxone administration and overdose response.
Anonymous online chat service providing real-time assistance and harm reduction information. Drug combination checker available at combo.tripsit.me.
Provides psychological support and training for navigating difficult psychedelic experiences. Offers a crisis peer support chat service.