What this app is

Dosina is a harm-reduction reference. It shows published dose ranges, timeline, expected effects, side effects, testing reactions and interaction warnings for commonly used psychoactive substances. Harm reduction does not tell people that using drugs is fine. It accepts that people do use them and tries to make that use less likely to kill or injure someone. That is why the interaction checker and the emergency tab are free of advertising and always one tap away.

What this app is not

• Not medical advice, and not a prescription tool.
• Not a vendor: Dosina contains no prices, no sources and no way to buy anything.
• Not a purity test. It cannot tell you what is in your substance.
• Not personalised to your health, your medication, your genes or your tolerance - beyond the inputs you provide.

How the dose numbers are calculated

Every level (threshold, light, common, strong, heavy) is taken from the source dataset for the specific route of administration. Nothing is invented or interpolated.

Weight scaling is applied only to substances whose dose genuinely tracks body mass - MDMA, MDA, ketamine, GHB/GBL/1,4-BD, DXM. For those, the published 70 kg range is divided by 70 and multiplied by your weight, then capped at the substance’s published ceiling so that a heavier user is never told to exceed the maximum anyone should take. For LSD, psilocybin, THC, opioids, benzodiazepines and most others, weight is NOT applied. The ranges you see are population ranges, because individual sensitivity, tolerance and metabolism dominate by a wide margin.

Alcohol is the one case where a real per-person formula exists, so we use it: Widmark’s equation, BAC% = (grams ethanol / (weight_kg x r x 1000)) x 100, minus 0.015 per hour of elimination, with r = 0.68 (male), 0.55 (female), 0.61 (unspecified).

We do not model tolerance, cross-tolerance, liver or kidney function, drug interactions on dose, or your individual genetics. Those are exactly the factors that make a "safe" number unsafe for a particular person, which is why every estimate here starts with the lowest plausible dose rather than a precise target.

Data sources and licences

Dose ranges, route-specific durations, tolerance, toxicity notes, reagent reactions and interaction categories. psychonautwiki.org

Interaction notes, free-text effect tags, detection windows and the extended research-chemical library. tripsit.me - github.com/tripsit/TripBot PolyForm Noncommercial does not permit commercial use. If Dosina is ever monetised (ads included), this dataset must either be licensed from TripSit or excluded from the build.

Written by the Dosina maintainer from the same public harm-reduction literature and reviewed against the machine-readable dose data.

Privacy

Dosina collects nothing. There is no account, no analytics and no server. Your biological sex, weight, experience level and medication flag are stored in this device’s local storage, are used only to compute the figures you see, and are deleted when you clear site data. The substance database is bundled with the app, so the library, the interaction checker and the emergency guidance all work offline, in airplane mode.

No prices, no vendors, no sourcing

Dosina deliberately contains no information about where to obtain any substance, no prices, no vendor names and no synthesis routes. That is a design decision as well as a store-policy requirement.

Credits