Complete dosage information for LSD — threshold, light, common, strong, and heavy dose ranges across 2 routes of administration.
Full LSD 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.
LSD has an extremely high therapeutic index, and no confirmed human deaths have been attributed to LSD toxicity alone at recreational doses. The estimated lethal dose in humans is unknown but projected to be far above doses commonly encountered. However, psychological distress, panic attacks, and dangerous behavior during acute intoxication can create medical emergencies. Signs of a challenging LSD experience requiring intervention include severe anxiety or panic, paranoid ideation, confused or disoriented behavior, aggression, self-harm attempts, or a complete break from reality. Physical symptoms of concern include hyperthermia (elevated body temperature), seizures (extremely rare), tachycardia (rapid heartbeat), or hypertension. If someone is experiencing a severe adverse reaction, move them to a calm, quiet environment and provide reassurance. Do not restrain them unless they are at immediate risk of harming themselves or others. Call emergency services (911 in the US) if the person is hyperthermic, seizing, exhibiting signs of serotonin syndrome, or if they become unresponsive. Good Samaritan laws in many jurisdictions protect individuals who call for help during a drug emergency from prosecution. In a clinical setting, benzodiazepines are the first-line treatment for acute LSD-related agitation or anxiety. ## Community Knowledge on Crisis Situations ### Managing a "Bad Trip" While not a medical overdose in the traditional sense, psychologically overwhelming LSD experiences are the most commonly reported crisis scenario in community discussions. Experienced community members recommend the following approach: - **Change the setting**: Moving to a different room, going outside, or changing the lighting and music can dramatically shift the experience - **Grounding techniques**: Holding a familiar object, feeling different textures, or focusing on breathing can help anchor awareness - **Reassurance phrases**: Simple, calm statements such as "You are safe," "You took a substance and this will pass," and "I am here with you" are widely recommended - **Avoid restraining** the person unless they are in immediate physical danger, as physical restriction can dramatically escalate panic - **Benzodiazepines** (such as diazepam or alprazolam) are widely discussed as "trip killers" that can reduce anxiety and attenuate psychedelic effects; many experienced users keep them on hand as an emergency measure, though they should be used judiciously and not as a routine part of psychedelic use ### When to Seek Emergency Help Community consensus aligns with medical guidance that emergency services should be contacted if a person: - Becomes a danger to themselves or others - Experiences seizures (extremely rare with LSD but possible with adulterants like NBOMe compounds) - Has sustained, uncontrollable hyperthermia - Enters a catatonic or completely unresponsive state - Expresses serious suicidal ideation Community members emphasize that Good Samaritan laws exist in many jurisdictions to protect those who seek medical help during drug emergencies, and that the risk of legal consequences should never prevent someone from calling for help when safety is at stake. ### Post-Crisis Aftercare Users who have experienced challenging trips frequently report that processing the experience afterward is critical. Community recommendations include: - Talking through the experience with a trusted friend or therapist within the first few days - Avoiding additional psychedelic use for an extended period (months to indefinitely) - Monitoring for persistent symptoms such as anxiety, depersonalization, or intrusive thoughts, and seeking professional help if they persist beyond a few weeks
A common sublingual dose of LSD is 75–150 µg.
The threshold dose for LSD via sublingual is approximately 15 µg.
LSD typically lasts 8–12 hours via sublingual.
LSD can be taken via sublingual, oral. Each route has different dosage ranges and onset times.