PRO-LAD (6-propyl-6-nor-lysergic acid diethylamide) is a synthetic psychedelic of the lysergamide family, first synthesized and characterized by David Nichols and colleagues at Purdue University in the 1980s as part of systematic structure-activity research on lysergamide compounds. It is structurally related to LSD but features a propyl group at the N6 position (rather than LSD's methyl group), replacing one of the ethyl groups on the diethylamide nitrogen. PRO-LAD is a direct-acting compound, not a prodrug — it acts at receptors in its own right.
PRO-LAD is generally described by community reports as having a character broadly similar to LSD but with notable differences in character: somewhat more visual and sensory, slightly shorter duration (6–9 hours), and with a quality that some users describe as more organic or grounded compared to LSD's sharp, analytical clarity. The propyl group's increased size relative to LSD's methyl group at N6 modifies receptor binding properties and likely underlies these subjective differences. Nichols' original research characterized PRO-LAD as having approximately equivalent potency to LSD in animal models.
Community experience with PRO-LAD is limited but consistent: the compound is recognized as a genuine and distinct psychedelic with its own character rather than simply an LSD equivalent. It has attracted users specifically interested in exploring the structure-activity landscape of lysergamides. The shorter duration compared to LSD may make it more practical for some contexts.
Testing with Ehrlich reagent is essential. All standard lysergamide contraindications apply, and the direct-acting nature of PRO-LAD means that its effects cannot be attributed to LSD metabolism.
Safety at a Glance
High Risk- Ehrlich reagent: purple/violet confirms an indole compound. As a less commonly available research chemical, adulterat...
- Community reports extrapolated with Nichols animal data suggesting LSD-equivalent potency:
- Toxicity: Acute Toxicity No formal toxicological data for PRO-LAD in humans. By structural and pharmacological analogy to LSD, ...
- Overdose risk: Fatal overdose from PRO-LAD alone, at doses within the typical recreational range, is extremely u...
If someone is in crisis, call 911 or Poison Control: 1-800-222-1222
Dosage
oral
Duration
oral
Total: 6 hrs – 8 hrsHow It Feels
The onset of PRO-LAD is measured and deliberate, arriving over thirty to forty-five minutes with a gradual tightening of sensory focus. The first physical signals are a mild increase in heart rate, a warmth spreading through the chest, and a subtle enhancement of tactile awareness. Light begins to appear slightly brighter, and there is a sharpening of visual acuity that gives objects a clean, high-definition quality before any overt psychedelic distortion appears.
The come-up is smooth and steady. PRO-LAD builds its effects in a linear, predictable fashion, each stage clearly succeeding the last. Visual enhancement develops from increased color saturation into gentle surface patterns, a slow breathing and flowing on textured surfaces, subtle geometric overlays in peripheral vision. The body settles into a state of moderate stimulation with a pleasant warmth. There is a mild body load, some tension in the jaw and shoulders, but it is manageable and fades into the background as the mental effects deepen.
At peak intensity, PRO-LAD delivers a moderate psychedelic experience that balances visual activity with cognitive depth. The visuals are present and engaging, patterned surfaces shift and flow, colors are vivid, and closed-eye imagery offers moderately complex geometric forms, but they do not reach the overwhelming intensity of ETH-LAD or the spectacular clarity of AL-LAD. The headspace carries genuine depth: there is a contemplative quality to thought, a willingness to examine beliefs and emotions, and a capacity for insight that rewards intentional exploration. Music is enhanced, carrying increased emotional resonance and spatial detail. Empathy and emotional openness are gently amplified.
The decline unfolds over several hours with a graceful diminishment of intensity. Visuals soften first, the flowing patterns settling into gentle breathing and then fading entirely. The cognitive depth gradually gives way to a clear, mildly elevated baseline. The afterglow is characterized by mental clarity, a gentle physical tiredness, and a quiet satisfaction that resembles the feeling after a long and rewarding conversation. PRO-LAD does not overwhelm or astonish, but it provides a solid, well-rounded lysergamide experience with a completeness and balance that justify its moderate potency.
Subjective Effects
The effects listed below are based on the Subjective Effect Index (SEI), an open research literature based on anecdotal reports and personal analyses. They should be viewed with a healthy degree of skepticism. These effects will not necessarily occur in a predictable or reliable manner, although higher doses are more liable to induce the full spectrum of effects.
Physical Effects
Physical(26)
- Appetite suppression— A distinct decrease in hunger and desire to eat, ranging from reduced interest in food to complete d...
- Bodily control enhancement— Bodily control enhancement is the subjective feeling of improved physical precision, coordination, a...
- Body load— A diffuse, heavy physical discomfort involving tension, pressure, and malaise in the torso and limbs...
- Dehydration— A state of insufficient bodily hydration manifesting as persistent thirst, dry mouth, and physical d...
- Difficulty urinating— Difficulty urinating, also known as urinary retention, is the experience of being unable to easily p...
- Excessive yawning— Involuntary, repeated yawning that occurs far more frequently than normal and often without the usua...
- Frequent urination— Increased urinary frequency beyond normal patterns, caused by diuretic effects or bladder irritation...
- Headache— A painful sensation of pressure, throbbing, or aching in the head that can range from a dull backgro...
- Increased blood pressure— Increased blood pressure (hypertension) is an elevation of arterial pressure above the normal 120/80...
- Increased bodily temperature— Increased bodily temperature (hyperthermia) is an elevation of core body temperature above the norma...
- Increased heart rate— A noticeable acceleration of heartbeat that can range from a subtle awareness of one's pulse to a fo...
- Laughter fits— Spontaneous, uncontrollable, and often prolonged episodes of intense laughter that erupt without any...
- Mouth numbing— Mouth numbing is a localized loss of sensation in the tongue, gums, cheeks, and surrounding oral tis...
- Muscle cramp— Muscle cramps are sudden, involuntary, and often painful contractions of muscles that occur as a sid...
- Nausea— An uncomfortable sensation of queasiness and stomach discomfort that may or may not lead to vomiting...
- Perception of bodily lightness— Perception of bodily lightness is the subjective feeling that one's body has become dramatically lig...
- Physical euphoria— An intensely pleasurable bodily sensation that can manifest as waves of warmth, tingling electricity...
- Pupil dilation— A visible enlargement of the pupil diameter (mydriasis) that can range from subtle widening to drama...
- Seizure— Uncontrolled brain electrical activity causing convulsions and loss of consciousness -- a life-threa...
- Serotonin syndrome— Serotonin syndrome is a potentially fatal medical emergency caused by excessive serotonergic activit...
- Stamina enhancement— Stamina enhancement is an increase in one's ability to sustain physical and mental exertion over ext...
- Stimulation— A state of heightened physical and mental energy characterized by increased wakefulness, elevated mo...
- Teeth grinding— An involuntary clenching and rhythmic grinding of the jaw muscles, known clinically as bruxism, that...
- Temperature regulation disruption— Impaired thermoregulation causing unpredictable fluctuations between feeling hot and cold, with risk...
- Vasoconstriction— A narrowing of blood vessels throughout the body that produces sensations of cold extremities, tingl...
- Watery eyes— Excessive tear production causing overflow tearing and blurred vision, commonly occurring during opi...
Cognitive & Perceptual Effects
Visual(19)
- After images— A visual phenomenon in which a faint, ghostly imprint of a previously viewed image persists in the v...
- Brightness alteration— Perceived increase or decrease in environmental brightness beyond actual illumination levels, common...
- Colour enhancement— An intensification of the brightness, vividness, and saturation of colors in the external environmen...
- Colour shifting— The visual experience of colors on objects and surfaces cycling through continuous, fluid transforma...
- Depth perception distortions— Alterations in how the distance of objects within the visual field is perceived, causing layers of s...
- Diffraction— The experience of seeing rainbow-like spectrums of color and prismatic halos embedded within bright ...
- Drifting— The visual experience of perceiving stationary objects, textures, and surfaces as appearing to flow,...
- External hallucination— A visual hallucination that manifests within the external environment as though it were physically r...
- Geometry— The experience of perceiving complex, ever-shifting geometric patterns superimposed over the visual ...
- Internal hallucination— Vivid, detailed visual experiences perceived within an imagined mental landscape that can only be se...
- Pattern recognition enhancement— An increased ability and tendency to perceive meaningful patterns, faces, and images within ambiguou...
- Peripheral vision changes— Alterations in side vision ranging from enhanced peripheral awareness to tunnel vision, with charact...
- Perspective distortions— Distortion of perceived depth, distance, and size of real objects, making things appear closer, furt...
- Perspective hallucination— A hallucinatory phenomenon in which the observer's visual perspective shifts from the normal first-p...
- Settings, sceneries, and landscapes— The perceived environment in which hallucinatory experiences take place, ranging from recognizable l...
- Symmetrical texture repetition— Textures appear to mirror and tessellate across surfaces in intricate, self-similar symmetrical patt...
- Tracers— Moving objects leave visible trails of varying length and opacity behind them, similar to long-expos...
- Transformations— Objects and scenery undergo perceived visual metamorphosis, smoothly shapeshifting into other recogn...
- Visual acuity enhancement— Vision becomes sharper and more defined than normal, as though a slightly blurry lens has been broug...
Cognitive(22)
- Amnesia— A complete or partial inability to form new memories or recall existing ones during and after substa...
- Analysis enhancement— A perceived improvement in one's ability to logically deconstruct concepts, recognize patterns, and ...
- Anxiety— Intense feelings of apprehension, worry, and dread that can range from a subtle background unease to...
- Conceptual thinking— A shift in the nature of thought from verbal, linear sentence structures to intuitive, non-linguisti...
- Confusion— An impairment of abstract thinking marked by a persistent inability to grasp or comprehend concepts ...
- Deja vu— Intense, often prolonged sensation of having already experienced the current moment, common with psy...
- Depression— A persistent state of low mood, emotional numbness, hopelessness, and diminished interest or pleasur...
- Immersion enhancement— A heightened capacity to become fully absorbed and engrossed in external media such as music, films,...
- Increased sense of humor— A general amplification of one's sensitivity to finding things humorous and amusing, often causing p...
- Introspection— An enhanced state of self-reflective awareness in which one feels drawn to examine their own thought...
- Language suppression— A diminished ability to formulate, comprehend, or articulate language, ranging from difficulty findi...
- Memory suppression— A dose-dependent inhibition of one's ability to access and utilize short-term and long-term memory, ...
- Novelty enhancement— A feeling of increased fascination, awe, and childlike wonder attributed to everyday concepts, objec...
- Paranoia— Irrational suspicion and belief that others are watching, plotting against, or intending harm toward...
- Personal bias suppression— A decrease in the personal, cultural, and cognitive biases through which one normally filters their ...
- Psychosis— Psychosis is a serious psychiatric state involving a fundamental break from consensus reality — char...
- Thought acceleration— The experience of thoughts occurring at a dramatically increased rate, as if the mind has been shift...
- Thought connectivity— A state in which disparate thoughts, concepts, and ideas become fluidly and spontaneously interconne...
- Thought disorganization— Thought disorganization is a cognitive impairment in which the normal capacity for structured, seque...
- Thought loops— Becoming trapped in a repeating cycle of thoughts, actions, and emotions that loops every few second...
- Time distortion— Subjective perception of time becomes dramatically altered — minutes may feel like hours, or hours p...
- Wakefulness— An increased ability to stay awake and alert without the desire to sleep. Distinct from stimulation ...
Auditory(4)
- Auditory distortion— Auditory distortion is the experience of sounds becoming warped, pitch-shifted, flanged, or otherwis...
- Auditory enhancement— Auditory enhancement is a heightened sensitivity and appreciation of sound in which music, voices, a...
- Auditory hallucination— Auditory hallucination is the perception of sounds that have no external source — hearing music, voi...
- Auditory misinterpretation— Auditory misinterpretation is the brief, spontaneous misidentification of real sounds as entirely di...
Multi-sensory(3)
- Olfactory hallucination— Olfactory hallucinations (phantosmia) involve the perception of convincing phantom smells — pleasant...
- Scenarios and plots— Scenarios and plots are the narrative structures that emerge within hallucinatory states — coherent ...
- Synaesthesia— Stimulation of one sense triggers involuntary experiences in another — seeing sounds as colors, tast...
Transpersonal(5)
- Ego death— A profound dissolution of the sense of self in which personal identity, memories, and the boundary b...
- Existential self-realization— A sudden, visceral realization of the profound significance and improbability of one's own existence...
- Perception of eternalism— The experience that all moments across the timeline of existence are equally real and simultaneously...
- Spirituality enhancement— A profound intensification of spiritual feelings, mystical awareness, and a sense of sacred connecti...
- Unity and interconnectedness— A profound sense that identity extends beyond the self to encompass other people, nature, or all of ...
Pharmacology
Mechanism of Action
PRO-LAD acts directly as a partial agonist at serotonin 5-HT2A receptors, without prodrug conversion. The propyl group at N6 modifies the binding geometry at the receptor compared to LSD's methyl group at this position, producing a somewhat different receptor engagement profile. Nichols and colleagues confirmed PRO-LAD's psychedelic activity in animal models and established its approximate potency equivalence to LSD. The compound disrupts normal thalamocortical signaling via 5-HT2A agonism in cortical pyramidal neurons, producing the characteristic perceptual, cognitive, and emotional alterations of classical psychedelics.
Receptor Targets
- 5-HT2A receptors — primary psychedelic target; partial agonist; propyl group at N6 produces modified binding geometry
- 5-HT1A receptors — likely partial agonist activity; contributes to introspective quality
- 5-HT2C receptors — expected affinity; anxiogenic contribution at high doses
- Dopamine D2/D3 receptors — moderate affinity; stimulant and mood component
- α-adrenergic receptors — sympathomimetic effects (tachycardia, mydriasis, vasoconstriction)
Pharmacokinetics
No formal human pharmacokinetic data exist for PRO-LAD. Community-reported onset of 30–75 minutes and duration of 6–9 hours are consistent with a shorter-acting lysergamide relative to LSD, possibly reflecting faster receptor dissociation kinetics from the propyl N6 modification. Metabolism is expected to be hepatic.
Tolerance
Cross-tolerance with LSD and all serotonergic psychedelics is expected. Functional tolerance within 24–48 hours, reversal over 5–7 days.
Detection Methods
Urine Detection
PRO-LAD and its metabolites are not targeted by standard immunoassay-based urine drug screens. Because lysergamides are active at microgram doses, the absolute quantity of drug and metabolite present in biological samples is extremely low, making detection inherently difficult. Specialized urine assays using liquid chromatography-tandem mass spectrometry (LC-MS/MS) can identify lysergamide metabolites within approximately 24 to 72 hours after ingestion, though this window is shorter than most other drug classes due to rapid metabolism and renal clearance.
Blood and Serum Detection
Blood detection windows for PRO-LAD are narrow. Plasma concentrations peak within 1 to 3 hours of oral administration and fall below detectable thresholds within 6 to 12 hours for most analytical methods. LC-MS/MS can extend this window modestly, but serum testing for lysergamides is rarely performed outside of forensic or research contexts due to the specialized equipment required and the very low concentrations involved.
Standard Drug Panel Inclusion
PRO-LAD is NOT included on standard 5-panel, 10-panel, or 12-panel drug screens. These panels test for amphetamines, cannabinoids, cocaine metabolites, opiates, and PCP (with extended panels adding benzodiazepines, barbiturates, and similar classes). Lysergamides do not cross-react with any of these immunoassay targets. Detection requires a specific request for lysergamide testing, which is uncommon in workplace, probationary, or emergency department screening.
Confirmatory Methods
When lysergamide use is specifically suspected, confirmatory testing relies on LC-MS/MS or gas chromatography-mass spectrometry (GC-MS). LC-MS/MS is the preferred method due to its superior sensitivity at picogram-per-milliliter concentrations. Immunoassay-based LSD-specific screens exist but suffer from high false-negative rates with novel lysergamide analogs, as antibody cross-reactivity varies between compounds.
Reagent Testing (Harm Reduction)
For harm reduction identification, the Ehrlich reagent is the primary tool for PRO-LAD. A small sample placed on the reagent should produce a purple to violet color change, indicating the presence of an indole moiety characteristic of lysergamides. The Hofmann reagent provides a confirmatory blue to purple reaction. Importantly, the Marquis reagent shows no reaction or a faint olive discoloration with lysergamides, which helps distinguish them from other compound classes. A positive Ehrlich result does not confirm the specific lysergamide identity but does rule out NBOMe and NBOH compounds, which show no Ehrlich reaction. Using both Ehrlich and Hofmann reagents together provides greater confidence in lysergamide identification.
Interactions
| Substance | Status | Note |
|---|---|---|
| 3-FMA | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| 4-MMC | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| 8-Chlorotheophylline | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| Adrafinil | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| Anandamide | Caution | Cannabis can unpredictably intensify psychedelic effects and increase anxiety |
| Cannabis | Uncertain | — |
| 1,3-Butanediol | Low Risk & Synergy | Cross-tolerance exists; effects compound |
| 25E-NBOH | Low Risk & Synergy | Cross-tolerance exists; effects compound |
| 2C-T | Low Risk & Synergy | Cross-tolerance exists; effects compound |
| 2C-T-2 | Low Risk & Synergy | Cross-tolerance exists; effects compound |
History
Scientific Origins
PRO-LAD was first synthesized by David Nichols and colleagues at Purdue University in the early 1980s as part of a systematic investigation of lysergamide structure-activity relationships. The research was published in the peer-reviewed scientific literature, making PRO-LAD one of the few research chemical lysergamides to have formal academic documentation of its synthesis and pharmacological activity prior to recreational use. Nichols' group was exploring how modifications to the N6 position and the diethylamide group of LSD affected receptor binding and psychedelic potency.
Research Chemical Era
PRO-LAD appeared in the research chemical market in the 2000s–2010s following wider community awareness of Nichols' publications and the broader documentation of lysergamide diversity. It gained a niche following among users specifically interested in structure-activity exploration rather than simply seeking the LSD experience.
Legal Status
PRO-LAD is not specifically scheduled under international drug conventions. It may fall under analog act provisions in the United States and novel psychoactive substance laws in the UK and EU. Legal status varies by jurisdiction and should be verified locally.
Harm Reduction
Testing
Ehrlich reagent: purple/violet confirms an indole compound. As a less commonly available research chemical, adulteration risk should not be dismissed.
Dosing
Community reports extrapolated with Nichols animal data suggesting LSD-equivalent potency:
- Threshold: 20–30 μg
- Light: 30–75 μg
- Common: 75–200 μg
- Strong: 200–350 μg
Start conservatively — the dose-response relationship for PRO-LAD in humans is not well-characterized compared to LSD.
Set and Setting
- Stable emotional state; familiar environment; trip sitter recommended
- The reportedly shorter duration may make PRO-LAD useful for contexts where the full 8–12 hours of LSD is impractical
- Plan for 10–12 hours regardless to account for afterglow and sleep effects
Dangerous Combinations
- Lithium — Contraindicated; seizure and cardiac events with lysergamides
- MAOIs — Serotonin syndrome risk
- Tramadol — Seizure risk
- Cannabis — Risk of amplified anxiety
- Stimulants — Cardiovascular and psychological intensity amplification
Emergency Protocol
- Difficult experience: environment change, grounding techniques, benzodiazepines (diazepam 10–20 mg)
- Emergency services for physical safety concerns
Toxicity & Safety
Acute Toxicity
No formal toxicological data for PRO-LAD in humans. By structural and pharmacological analogy to LSD, acute toxicity is expected to be very low. No pharmacologically attributable fatalities documented.
Cardiovascular Effects
Sympathomimetic effects consistent with the lysergamide class: mild tachycardia, blood pressure elevation, mydriasis. Individuals with cardiovascular disease should not use this compound.
Psychological Risks
- Acute anxiety and panic — dose-dependent; experience character similar to LSD per community reports
- Psychosis induction — absolute contraindication with history of schizophrenia or bipolar I disorder
- HPPD — risk with any serotonergic psychedelic
Contraindications
Personal or family history of psychosis or bipolar disorder; lithium, MAOI, antipsychotic, or tramadol use; cardiovascular disease.
Overdose
No documented pharmacological overdoses. Benzodiazepines for acute psychological distress.
Addiction Potential
not habit-forming
Overdose Information
Fatal overdose from PRO-LAD alone, at doses within the typical recreational range, is extremely unlikely based on the available evidence for classical psychedelics. The therapeutic index for most psychedelics is very wide.
However, psychological emergencies can occur and require appropriate response:
- Severe anxiety, panic, or psychotic episodes
- Dangerous behavior due to impaired reality testing
- Self-harm in the context of a distressing experience
Emergency management: If someone is experiencing a severe adverse reaction, move them to a calm, quiet environment. Speak reassuringly. Do not restrain unless there is immediate danger. Benzodiazepines (if available and the person is conscious and able to swallow) can reduce acute anxiety. If psychotic symptoms, self-harm risk, or medical distress is present, seek emergency medical attention.
Medical attention: Seek help immediately for seizures, extremely elevated body temperature, signs of serotonin syndrome (agitation, tremor, diarrhea, rapid heart rate), or if the substance consumed is uncertain.
Tolerance
| Full | almost immediately after ingestion |
| Half | 5-7 days |
| Zero | 14 days |
Cross-tolerances
Legal Status
Austria: PRO-LAD is technically not illegal but it may fall in the NPSG (Neue-Psychoaktive-Substanzen-Gesetz Österreich) as an analogue of LSD.
Germany: PRO-LAD is controlled under the NpSG (New Psychoactive Substances Act) as of July 18, 2019. Production and import with the aim to place it on the market, administration to another person and trading is punishable. Possession is illegal but not penalized.
Latvia: PRO-LAD is illegal in Latvia. Although it isn't officially scheduled, it is controlled as an LSD structural analog due to an amendment made on June 1, 2015.
Switzerland: On December 1, 2015, Switzerland added PRO-LAD to the list of controlled substances. It is a controlled substance specifically named under Verzeichnis E.
United Kingdom: As of January 7, 2015, PRO-LAD is specifically named in the U.K. Misuse of Drugs Act as a Class A drug.
Responsible use (Hallucinogens)
Research chemical
Hallucinogens
Psychedelic
Lysergamide
LSD
PRO-LAD (Wikipedia)
PRO-LAD (TiHKAL / Isomer Design)
Hoffman, A. J., & Nichols, D. E. (1985). Synthesis and LSD-like discriminative stimulus properties in a series of N (6)-alkyl norlysergic acid N, N-diethylamide derivatives. Journal of Medicinal Chemistry, 28(9), 1252-1255. https://doi.org/10.1021/jm00147a022.
Watts, V. J., Mailman, R. B., Lawler, C. P., Neve, K. A., & Nichols, D. E. (1995). LSD and structural analogs: pharmacological evaluation at D1 dopamine receptors. Psychopharmacology, 118(4), 401-409. https://doi.org/10.1007/BF02245940.
Niwaguchi, T., Nakahara, Y., & Ishii, H. (1976). Studies on lysergic acid diethylamide and related compounds. IV. Syntheses of various amide derivatives of norlysergic acid and related compounds. Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan, 96(5), 673-678. PMID 987200.
Pfaff, R. C., Huang, X., Marona-Lewicka, D., Oberlender, R., & Nichols, D. E. (1994). Lysergamides Revisited. NIDA Research Monograph, 146, 52-73. PMID: 8742794.
Experience Reports (1)
Tips (3)
Use a milligram scale to weigh PRO-LAD if it comes as a powder. Eyeballing doses of potent psychedelics is irresponsible. A quality 0.001g scale costs under $30 and could prevent a seriously overwhelming experience.
Clear your schedule for the full duration of PRO-LAD plus afterglow. Do not plan any obligations, driving, or important decisions for the day. Having a time pressure or commitment hanging over you adds unnecessary anxiety.
Do not combine PRO-LAD with lithium (seizure risk), tramadol (seizure/serotonin syndrome risk), or cannabis at higher doses unless very experienced. Cannabis dramatically intensifies and can destabilize a psychedelic experience.
See Also
Same Class
References (5)
- Psilocybin produces substantial and sustained decreases in depression and anxiety — Griffiths et al. Journal of Psychopharmacology (2016)paper
- Neural correlates of the LSD experience revealed by multimodal neuroimaging — Carhart-Harris et al. PNAS (2016)paper
- PubChem: PRO-LAD
PubChem compound page for PRO-LAD (CID: 44457803)
pubchem - PRO-LAD - TripSit Factsheet
TripSit factsheet for PRO-LAD
tripsit - PRO-LAD - Wikipedia
Wikipedia article on PRO-LAD
wikipedia