Complete dosage information for 2C-B — threshold, light, common, strong, and heavy dose ranges across 4 routes of administration.
Full 2C-B profileImportant Safety Notice
Dosage information is for harm reduction purposes only. Individual sensitivity varies greatly. Always start with the lowest effective dose and work your way up slowly. Never eyeball doses — use a milligram scale.
Fatal overdose from 2C-B alone has not been well-documented in the medical literature, and 2C-B is generally considered to have a **reasonable safety margin** at typical doses. However, extremely high doses can produce dangerous sympathomimetic effects including severe hypertension, tachycardia, hyperthermia, and seizures. ## Signs Requiring Medical Attention Signs of an adverse 2C-B reaction requiring medical attention include: - Severe and uncontrollable anxiety or panic - Extremely rapid heartbeat - Dangerously high blood pressure - Seizures - Very high body temperature - Persistent severe nausea and vomiting - Psychotic behavior including aggression or self-harm attempts - **Throat tightness or difficulty breathing** -- reported by some users at high doses, which can be a source of significant distress and may represent either a physical reaction or anxiety-driven perception **Call emergency services (911)** if any of these symptoms are observed. ## While Waiting for Emergency Services 1. **Reassure the person** and move them to a calm, quiet environment. Many community accounts of acute 2C-B distress emphasize that calm reassurance and a change of environment are the most immediately effective interventions. 2. **If they are overheating**, apply cool water to the skin 3. **If they are seizing**, protect their head and clear hazards from the area 4. **Do not leave the person alone** -- distressed individuals on psychedelics benefit enormously from a calm, grounding presence ## Hospital Treatment In a medical setting, **benzodiazepines** are the first-line treatment for acute psychedelic-related agitation and anxiety. Supportive care including monitoring of cardiovascular parameters and temperature is the standard approach. Good Samaritan laws apply. ## Managing Difficult Experiences at Home For 2C-B-related distress that does not require emergency medical attention, community-tested approaches include: - **Changing the setting**: Moving to a different room, going outside, or changing the lighting and music - **Companionship**: Having a calm, sober friend provide grounding conversation - **Breathing exercises**: Slow, rhythmic breathing to counteract panic - **Physical grounding**: Cold water on hands or face, holding an ice cube, or wrapping in a comfortable blanket - **Time reassurance**: Reminding the person that 2C-B's effects are relatively short-lived (4-6 hours) and that the intensity will diminish - **Avoiding additional substances**: Cannabis in particular can dramatically intensify 2C-B's effects and increase anxiety - **Reducing future doses**: Users who have had a difficult experience at one dose consistently report much more positive experiences at reduced doses, typically 5-10 mg lower than the problematic dose
A common intravenous dose of 2C-B is 2.5–5 mg.
The threshold dose for 2C-B via intravenous is approximately 1 mg.
2C-B typically lasts 2–3 hours via intravenous.
2C-B can be taken via intravenous, rectal, insufflated, oral. Each route has different dosage ranges and onset times.