Critical riskSubstance-specific
Alkohol / Ethanol
x GHB
Kritisch: schwere ZNS-Dämpfung, Bewusstlosigkeit und Atemdepression
Medium confidence3
Laden…
Source-linked harm reduction
Risks, mechanisms, and warnings for substance combinations.
Analyze pharmacological interactions between substances
Scientific education tool — not medical or clinical advice. In emergencies, contact emergency services immediately.
Benzodiazepine
Depressiva
Fentanyl
Opioide
Everyday examples
Selected high-signal pairs resolved through the same interaction index as the detail pages.
Alkohol / Ethanol
x GHB
Kritisch: schwere ZNS-Dämpfung, Bewusstlosigkeit und Atemdepression
Class notes show recurring interaction patterns and link to example substances.
Serotonergic psychedelics alter perception, cognition, and body state mainly through 5-HT2A-linked mechanisms.
Key interaction concerns include MAOIs, lithium, stimulants, and other strongly serotonergic profiles.
Prefill checkerClass-based warnings are a safety floor, not a substitute for substance-specific review. Risk depends on dose, route, timing, tolerance, health status, and individual factors. This is informational and not medical advice.
Evaluation logic
The hub focuses on psychoactive substances, medication classes and common polydrug scenarios, not on a general pharmacy database.
Two substances or classes are checked against the interaction index.
Synapedia describes whether serotonergic, GABAergic or cardiovascular effects overlap.
Entries are classified as critical, high, moderate, low or open.
The content is source-linked, but not clinically reviewed. It does not replace medical assessment; seek medical help for acute symptoms.
Benzodiazepine
x Opioid
Kritisch: additive ZNS-Dämpfung mit Atemdepression, Koma und Todesrisiko
Alkohol / Ethanol
x Kokain
Hohes Risiko: Cocaethylen, längere Stimulation und stärkere Herzbelastung
MDMA
x SSRI
Hohes Risiko: serotonerge Doppelwirkung, veränderte MDMA-Wirkung und Warnzeichen für Serotonintoxizität
Alkohol / Ethanol
x Ketamin
Hohes Risiko: additive Sedierung, Erbrechen, Sturz- und Aspirationsgefahr
Stimulants typically increase dopaminergic and noradrenergic activity and strain cardiovascular, sleep, and temperature regulation.
MAOIs, other stimulants, and strongly serotonergic substances are especially important interaction contexts.
Depressants reduce central nervous system activity through GABAergic, opioid, or related sedating mechanisms.
The core safety floor is additive sedation, including respiratory depression when multiple depressants overlap.
Prefill checkerDissociatives often act through NMDA antagonism and alter body perception, pain processing, and orientation.
Important combinations include depressants, stimulants, serotonergics, and substances with cardiovascular strain.
Prefill checkerOpioids act at opioid receptors and can cause analgesia, sedation, and respiratory depression.
Benzodiazepines, alcohol, GHB, and other depressants increase additive respiratory-depression risk.
Prefill checkerBenzodiazepines enhance GABA-A signaling and can be sedating, anxiolytic, muscle-relaxing, and anticonvulsant.
Opioids, alcohol, GHB, and other depressants are the central interaction group for additive respiratory depression.
Prefill checkerCannabinoids modulate the endocannabinoid system and can affect perception, anxiety, cardiovascular state, and sedation.
Relevant concerns include additive sedation, amplified psychoactive effects, and individual anxiety or cardiovascular responses.
Prefill checkerSSRIs increase serotonergic signaling by inhibiting serotonin reuptake.
MAOIs, MDMA, tramadol, DXM, and other serotonergic profiles are especially relevant.
Prefill checkerSNRIs increase serotonergic and noradrenergic signaling and can combine serotonin and cardiovascular concerns.
MAOIs, MDMA, tramadol, DXM, and other serotonergic substances are central interaction contexts.
Tricyclic antidepressants affect monoamine transporters and additional receptor systems, often with anticholinergic effects.
MAOIs, serotonergic substances, and other cardiovascularly stressful combinations are especially relevant.
MAOIs reduce monoamine breakdown and can strongly alter effects of many serotonergic or adrenergic substances.
Many combinations with MDMA, stimulants, SSRIs/SNRIs, tramadol, or DXM are high-risk or critical.
Acute warning signs are highlighted so medical help is not delayed.
Use context
People looking for an initial risk signal before a combination is considered.
Peers, family members and support services trying to understand warning signs.
Healthcare-adjacent professionals and researchers who need quick source and mechanism signals.
Internal links
These indexable detail pages are warning and orientation pages. They do not provide dosing guidance or instructions to bypass risk.
Positioning
The focus is on substances, classes and polydrug contexts that classic systems often expose only indirectly.
Entries explain why a risk is plausible instead of only showing an abstract warning level.
Red flags and sources provide orientation without normalizing use or replacing medical advice.
Limits
Not every possible substance combination is covered. Missing data is not reassurance.
Some entries refer to substance classes and do not represent every individual compound with equal precision.
Amount, timing, health status, tolerance and additional substances can change risk.
Trust layer
196 interaction entries are available in the static index; 189 include explicit source links. Currently 0 entries are marked as human-reviewed. Unless human review is explicitly shown, treat entries as curated and source-linked, but not clinically reviewed.
FAQ
The checker can provide signals for known interactions between psychoactive substances, medication classes and common polydrug scenarios. It shows risk level, likely mechanism, red flags and source context, but it does not replace medical assessment.
Synapedia includes classes such as SSRIs, MAOIs, benzodiazepines and opioids when they are represented in the interaction data. Results are source-linked, but not clinically reviewed; prescribed medication combinations should be discussed with a healthcare professional.
Not every combination is documented. Missing data is not reassurance; it only means Synapedia currently has no sufficiently structured entry to show.
Unconsciousness, breathing problems, seizures, severe overheating, chest pain, severe confusion or non-wakeable sedation require urgent medical help.