How Long Does LSD Last? A Complete Timeline of the Trip
LSD lasts 8–12 hours depending on dose. Here's the full timeline from first alert to afterglow, backed by clinical pharmacokinetics data.
May 13, 2026 · Rave Wellness
LSD lasts 8 to 12 hours for most recreational doses, with the peak occurring around 2–3 hours after ingestion. The most precise data comes from a clinical pharmacokinetics study (PMID 28197931) that measured both blood levels and subjective effects in human subjects: at 100 µg, effects lasted an average of 8.2 hours; at 200 µg, they lasted 11.6 hours. What follows is a detailed breakdown of what happens at each stage.
Quick answers
How long does LSD last? Typically 8–12 hours for common recreational doses. Lower doses (50–75 µg) may end closer to 6–8 hours; higher doses (200+ µg) can extend to 12–14 hours.
When does LSD peak? Peak effects occur approximately 2–3 hours after ingestion, according to clinical studies of 100–200 µg doses (PMID 28197931).
When does LSD kick in? Most people notice first effects 30–60 minutes after ingestion. Effects begin as early as 20 minutes in some cases.
How long does it take to fully come down? The main experience winds down by hours 8–10, but many people feel residual stimulation, altered mood, or insomnia for several hours beyond that.
Will I be able to sleep after LSD? Probably not for 10–14 hours after taking it. LSD has significant stimulant properties and suppresses sleep even after visual effects have resolved.
The full LSD timeline
T+0:00 — Ingestion
You take the tab (or liquid drop, or blotter). Nothing happens yet. LSD is typically administered sublingually (held under the tongue) to speed absorption — the mucous membranes absorb it faster than the stomach. Keep it under your tongue for 15–20 minutes if possible before swallowing.
T+0:20 to T+0:45 — First alert
The first signs are subtle and easy to doubt: a slight shift in how light looks, mild restlessness or excitement, a faint tingling sensation. Some people feel nausea in this window. These are not the trip — they are the ramp-up. Don’t redose here.
T+0:45 to T+1:30 — Onset
Effects become unambiguous. Visual changes begin: colors become more saturated, edges sharpen or shimmer, patterns may appear on surfaces. Thoughts start to move faster or in unexpected directions. Emotional tone shifts — this is where anxiety can emerge if it’s going to. Physical effects include pupil dilation, increased heart rate, jaw tension, and mild temperature dysregulation.
The plasma half-life of LSD is approximately 2.6 hours (PMID 28197931), meaning blood levels drop relatively quickly — but subjective effects outlast peak plasma levels significantly, because LSD binds very tightly to 5-HT2A serotonin receptors and creates a receptor activation cascade that continues after LSD itself has cleared.
T+2:00 to T+4:00 — Peak
This is the most intense phase. Visual effects are strongest — closed-eye visuals (CEVs) and open-eye visuals (OEVs), geometric patterns, tracers, distortion of faces or objects. Thinking is non-linear; connections between ideas feel profound. Time perception is significantly distorted — an hour can feel like minutes or like much longer.
Peak subjective effects in clinical studies were reached 2.5–2.8 hours after ingestion for 100–200 µg doses. At 200 µg, the peak is both higher and slightly later.
This is also the window where the experience is most demanding. If anxiety or difficult emotions are going to emerge strongly, they typically do so here. Having a trusted person present and a calm, familiar environment substantially reduces the likelihood of a challenging experience.
T+4:00 to T+6:00 — Plateau
Intensity begins to gradually ease, but you are still firmly in the experience. Visual effects persist but may become less overwhelming. Thinking remains altered. Many people find this the most rewarding part of the trip — enough intensity to feel meaningful, less pressure than the peak.
This is when conversation, music, and being outdoors feel most accessible. Some people find the plateau phase lasts longer than expected, which can be disorienting if you were expecting to “come down” by now.
T+6:00 to T+8:00 — Gradual descent
Effects become noticeably less intense. Visual distortions become subtle rather than prominent. Thinking begins to feel more linear. Appetite may return. Fatigue from the sustained mental activity may start to surface.
For a 100 µg dose, most people have largely resolved effects by hour 8–9. At higher doses, this phase extends.
T+8:00 to T+12:00 — Coming down / afterglow
Visual effects are mostly resolved, though some people experience mild perceptual changes for hours longer (this is normal and not HPPD unless it persists for days or weeks). Thinking is still somewhat altered — more introspective than usual, with heightened emotional sensitivity.
Sleep is typically not possible until at least 10–12 hours after ingestion due to LSD’s stimulant properties (norepinephrine and dopamine release, alongside serotonin). Plan for this. Trying to force sleep too early leads to frustration.
What affects duration
Dose is the primary variable. A 50 µg tab will last roughly 6–8 hours. A 200 µg dose can push 12+ hours. Street tabs vary widely in actual content — nominal dose claims are unreliable.
Individual metabolism matters but to a lesser degree. CYP3A4 enzyme activity (which metabolizes LSD in the liver) varies between people, but the clinical half-life range is relatively narrow (2.2–3.4 hours).
Redosing extends duration non-linearly. Taking a second dose 2–3 hours in will extend and intensify the experience significantly and makes the timeline much harder to predict. Many challenging experiences are the result of redosing because the first dose “felt weak.”
Tolerance develops rapidly. If you’ve taken LSD in the past 2–4 days, you’ll need a substantially higher dose for similar effects. Cross-tolerance with psilocybin is significant.
Planning around the timeline
The most practical implication: block out a full day. If you take LSD at noon, plan to be impaired until at least 10 PM, and unable to sleep until midnight or later. Do not schedule obligations, drive, or make important decisions during this window.
If you’re using in an unfamiliar or semi-public setting (a festival, for example), know that the come-up phase is when anxiety is most likely to emerge — having a plan for where to go if you need a quieter space reduces that risk.
For a full overview of LSD’s effects, risks, and safer use practices, see our LSD harm reduction guide. If you’re combining LSD with other substances, check our drug interaction guide first.
Sources: PMID 28197931 | PMID 26108222