Our Sources
All data in cheqit comes from established harm reduction organisations, clinical databases, and peer-reviewed sources. Where sources disagree on risk levels, we use the higher (more cautious) rating. Transparency about where our information comes from is essential to trust.
How we use this data
- •Interaction checker: TripSit provides the base matrix. We cross-reference with European harm reduction charts and upgrade risk ratings where the multi-source consensus is higher.
- •Substance profiles: TripSit for base data, PsychonautWiki for structured dosage and duration information.
- •ARV interactions: Manually curated from University of Liverpool's chemsex interaction documents — the clinical gold standard.
- •Crisis resources: Compiled from official government and NGO sources, verified for accuracy.
Primary Data Sources
TripSit
Interaction data & substance profiles
Open-source community harm reduction database. Provides the base interaction matrix covering 555+ substances and their combination risks.
Licence: Free for non-commercial use
PsychonautWiki
Dosage, duration & effect data
Community-maintained wiki with structured substance data via GraphQL API. Provides detailed dosage ranges by route of administration, duration timelines, and effect profiles.
Licence: CC-BY-SA 4.0
University of Liverpool HIV Drug Interactions
ARV + recreational drug interactions
Gold-standard clinical resource for HIV medication interactions. Our ARV interaction checker data is curated from their chemsex interaction documents covering all approved antiretrovirals.
Licence: Clinical reference (manually curated)
European Harm Reduction Sources
Our chemsex interaction data is cross-referenced against published interaction charts from these organisations. Where their consensus rating is higher than TripSit alone, we use the more cautious assessment.
saferparty.ch
Switzerland
Drug checking and harm reduction service run by the City of Zurich. Provides substance testing results and interaction data used in nightlife settings.
checkit!
Austria
Vienna-based drug checking and harm reduction programme. Provides on-site testing at events and publishes interaction warnings.
drugscout.de
Germany
German harm reduction organisation providing substance information, drug checking alerts, and interaction data.
mindzone.info
Germany
Bavarian nightlife harm reduction project providing substance information and safer-use education.
pharmawiki.ch
Switzerland
Independent pharmaceutical information portal used as a cross-reference for drug interaction mechanisms.
DIMS / Trimbos Institute
Netherlands
Dutch national drug monitoring system with 33 testing facilities. Over 100,000 samples tested since 1992. Provides purity data and Red Alert warnings.
EUDA (European Union Drugs Agency)
EU
Formerly EMCDDA. Provides European drug situation data, prevalence statistics, and new psychoactive substance alerts.
Clinical & NGO References
DDInter 2.0
Open-access pharmaceutical drug interaction database with 302,516 drug-drug interaction records. Used for cross-referencing interaction mechanisms.
GGD Amsterdam
Amsterdam public health service chemsex programme. Peer counselling data and chemsex research.
Mainline
Dutch harm reduction organisation with 35+ years of expertise. Chemsex support and substance information.
Important disclaimer
This app provides information for harm reduction purposes only. It is not medical advice. While we strive for accuracy and use the most reliable sources available, substance interaction data is inherently complex and evolving. Individual reactions can vary based on dosage, body weight, tolerance, health conditions, and other factors not captured here.
Always consult a healthcare professional for medical advice. In an emergency, call your local emergency number.