An LSD trip typically lasts 8 to 12 hours from start to finish, with effects beginning 30 to 90 minutes after you place a tab on your tongue. The total duration depends heavily on the dose, and lingering aftereffects can stretch the full experience closer to 24 hours before you feel completely back to normal.
Trip Timeline: Onset to Comedown
The first effects usually appear within 30 to 90 minutes. Early signs are subtle: a shift in mood, mild visual changes, or a sense that something feels “different.” Effects build from there and reach their strongest point around 3 to 5 hours after dosing. This peak is the most intense part of the experience, where visual distortions, altered thinking, and emotional shifts are most pronounced.
After the peak, effects gradually taper over the next several hours. The total active trip can last up to 12 hours at common doses. Once the primary effects fade, many people experience a period sometimes called the “afterglow,” which can include lingering feelings of happiness, mild anxiety, or a sense of lightness. This afterglow phase can persist for roughly another six hours. Between the trip itself and this wind-down period, it can take up to 24 hours for your body and mind to fully return to baseline.
How Dose Changes the Duration
One of the clearest findings from controlled research is that higher doses produce longer trips. In a placebo-controlled study published in Nature that tested doses ranging from 25 to 200 micrograms, the average duration of noticeable effects increased from about 6.7 hours at the lowest dose to 11 hours at the highest. Effects were dose-proportional, meaning a tab with more LSD on it doesn’t just hit harder; it keeps going longer.
A typical street tab contains somewhere between 50 and 150 micrograms, though this varies widely since there’s no standardization. At the lower end of that range, you might be looking at a 7 to 8 hour experience. At the higher end, plan for 10 to 12 hours. Microdoses (roughly 10 to 25 micrograms) produce much shorter and subtler effects, sometimes only a few hours of mild perceptual shifts.
Why LSD Lasts So Long
Most psychoactive substances are in and out of receptor sites relatively quickly. LSD is unusual because it essentially gets trapped inside serotonin receptors. Structural biology research has shown that once LSD binds to a serotonin receptor, part of the receptor folds over the molecule like a lid, holding it in place far longer than most drugs. This extended “residence time” means the receptor keeps firing signals even as LSD is being cleared from the bloodstream, which is why you can still feel strong effects hours after blood levels have dropped.
Factors That Make Trips Shorter or Longer
Beyond dose, several individual factors influence how long the experience lasts. Your liver processes LSD through specific enzyme pathways, and genetic differences in those enzymes can speed up or slow down how quickly your body breaks the drug down. This means two people taking the same tab can have noticeably different trip lengths.
Certain medications also interact with LSD’s duration and intensity. Tricyclic antidepressants and lithium have been associated with stronger, potentially longer responses. MAOIs, on the other hand, appear to reduce LSD’s effects. The interaction between SSRIs and LSD is less clearly documented in controlled settings, but many users report blunted or shortened experiences. If you’re on any psychiatric medication, the interaction is unpredictable enough to warrant caution.
Other practical factors include whether you’ve eaten recently (a full stomach can delay onset but doesn’t necessarily shorten the trip), your overall tolerance (frequent use builds rapid tolerance), and your mental state going in.
How Long LSD Stays in Your System
The trip outlasts the drug’s presence in your blood by a significant margin. LSD blood levels peak about 1.7 hours after ingestion, and the drug has a half-life of roughly 4 hours. At a standard dose, LSD is detectable in blood for about 8 hours. At higher doses (around 200 micrograms), detection extends to about 16 hours.
In urine, LSD and its breakdown products are measurable within the first 24 hours. The breakdown products are present at concentrations 16 to 43 times higher than LSD itself, which is what specialized tests actually look for. That said, most routine urine drug screens do not test for LSD at all. Standard workplace panels (the typical 5-panel or even 10-panel tests) don’t include it. Only specialized assays will pick it up, and even those have a narrow detection window of about 24 hours.
How to Store Tabs Without Losing Potency
LSD is fragile. It breaks down quickly when exposed to light, heat, oxygen, and moisture. Research on LSD stability has shown that the compound degrades rapidly when dissolved in water and exposed to light, converting into inactive byproducts. The three main enemies are ultraviolet light, warm temperatures, and humid air.
For practical storage, keep tabs wrapped in aluminum foil inside a sealed bag or container, stored somewhere cool and dark. A refrigerator works well, though room temperature is fine if the space stays below about 77°F (25°C) and light exposure is minimal. Properly stored tabs can retain their potency for months to years. Tabs left out on a counter, exposed to sunlight, or stored in a warm, humid environment will lose potency much faster, sometimes noticeably within days to weeks.