3C-E
4-ethoxy-3,5-dimethoxyamphetamine
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3C-E (3,5-dimethoxy-4-ethoxyamphetamine) is a synthetic psychedelic of the phenethylamine class. It is a close structural relative of mescaline, built from the same molecular scaffold with a modified 4-position group and a longer side chain. It activates serotonin receptors in the brain,[1] producing the visual and cognitive shifts characteristic of classical psychedelics.
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LSD, psilocybin, mescaline +2 moreLSD, psilocybin, mescaline, DOx series, 2C-x series show less
Synthesized by Alexander Shulgin and published as entry #25 in PiHKAL (1991),[2] 3C-E arose from Shulgin's systematic exploration of mescaline-derived compounds. No clinical trials have ever been conducted, and it attracted minimal research attention outside Shulgin's circle. Today it remains rare — an uncommon research chemical, unscheduled by name in most countries but legally precarious as a mescaline structural analog.
Subjective effects include geometric visual patterns, color enhancement, closed-eye imagery, trembling, and generalized bodily heaviness. The experience is defined by the tension between rich, jewel-like visuals and a persistent physical burden — nausea, muscle tension, and somatic discomfort that dominates the session, especially at higher amounts.[3] Bruxism and pre-nausea discomfort are characteristic unwanted effects.
3C-E does not produce physical dependence, and no fatalities have been attributed to it — though this reflects its rarity, not established safety.[4] The central risk is a steep dose-response curve: modest dose increases sharply intensify both physical discomfort and psychological difficulty.[3] What is known rests almost entirely on Shulgin's bioassays and one mouse study — formal human research does not exist.[1]
History[edit]
Discovery
3C-E was first synthesized by Alexander Shulgin and published as entry #25 in PiHKAL: A Chemical Love Story (1991).[2] He built it from mescaline by replacing one methoxy group with an ethoxy group and extending the side chain to an amphetamine structure. Shulgin and a small circle of subjects tested it at 30–60 mg, finding vivid closed-eye visuals alongside notably heavy body load.[3]
Research significance
No pharmaceutical company or clinical institution has developed 3C-E. In 2019, Halberstadt et al. confirmed serotonin 2A receptor agonist activity and showed that the 4-ethoxy substitution increases potency compared to the parent compound.[1] That study remains the only published pharmacology research on the compound.
Prohibition and modern status
3C-E is not named in most drug schedules. In the United States, it is potentially prosecutable as a mescaline structural analog under the Federal Analogue Act.[5] The United Kingdom banned it under the Psychoactive Substances Act 2016, and Germany controlled it under NpSG from November 2016.[5]
The "3C" designation marks the three-carbon aminopropyl side chain that distinguishes this amphetamine series from the two-carbon 2C phenethylamine compounds. The "E" indicates the ethoxy group at the 4-position.
Chemistry[edit]
Structural class
3C-E belongs to the 3C series — synthetic psychedelics built on the same 3,4,5-trisubstituted benzene ring as mescaline, extended to an amphetamine-type side chain.[3] The specific difference from the parent compound TMA is a single change: one methoxy group at the 4-position replaced by an ethoxy group. That one-carbon extension increases potency.[1]
Molecular identity
| Molecular formula | C₁₃H₂₁NO₃ |
| Molecular weight | 239.31 g/mol |
The amphetamine backbone makes the 3C series more potent than their two-carbon phenethylamine counterparts.[6] Unlike the related 2C and DOx series, the 3,5-dimethoxy groups of the mescaline scaffold require conformational flexibility to activate serotonin receptors.[7] All experimentation has used the racemic mixture; the compound is reported as a white crystalline powder in its hydrochloride salt form.[3]
Pharmacology[edit]
Mechanism of action
3C-E directly activates serotonin receptors without releasing stored monoamines. Mouse pharmacology confirms dose-dependent activity with potency exceeding TMA.[1] Studies of TMA show no detectable monoamine release[8] — 3C-E is expected to share this profile inferred — and the behavioral assay used correlates strongly with human psychedelic potency across dozens of compounds.[9]
Pharmacokinetics
No human pharmacokinetic data exist for 3C-E. Based on Shulgin's reports, oral effects begin within 1–2 hours and last 8–12 hours at 30–60 mg.[3] Metabolism likely involves liver breakdown of the alkoxy groups via CYP2D6 enzymes — though this is inferred from the related 2,5-dimethoxy series and needs direct confirmation.[10] inferred
Neuroscience[edit]
Where it acts
3C-E activates serotonin receptors in the outer layers of the prefrontal cortex — the region governing perception, reasoning, and self-awareness. This disrupts how the brain filters incoming sensory information. Studies of the parent scaffold TMA show no monoamine release,[8] pointing to direct receptor activation as the mechanism rather than a flood of brain chemicals.
Why it matters
One leading theory holds that serotonin agonists loosen the brain's high-level predictions, letting raw sensory signals break through more forcefully. The reported pattern — vivid visuals with intact self-awareness at moderate doses — fits this model: strong enough to produce novel percepts without dissolving the sense of self entirely.
Does 3C-E produce the same brain network changes seen with psilocybin and LSD? The mescaline pharmacophore works through the same receptor, but its distinct binding profile may produce different network-level effects.
Subjective Effects[edit]
The 3C-E experience is shaped above all by its body load. Nausea, muscle tension, and generalized heaviness run throughout the session — not as occasional discomfort but as a persistent foreground. The visual effects can be jewel-like and immersive, but the body rarely disappears from awareness.[3]
Compared to mescaline, 3C-E is more potent per milligram and heavier on the body relative to its visual effects. Against the DOx series it shares a similarly long duration, but arises from different underlying chemistry with its own distinct character.[1]
Effect Grid
Full psychedelic experience with clear visual phenomena — color enhancement, visual drifting, and closed-eye geometry featuring bright, jewel-like imagery. Internal hallucinations with complex fantasy elements emerge. Thought connectivity and conceptual thinking become prominent, with time alteration creating a sense of temporal distortion.
Body load is the defining somatic feature at this tier. Nausea, muscle tension, bruxism, and spontaneous body sensations are common and may dominate the first 1-2 hours. Stimulation is sustained, with pronounced wakefulness. Shulgin reported that 40 mg produced a strong sense of control, while 60 mg brought vivid visuals alongside significant body discomfort — the dose-response between these points is steep.
Sleep is impossible for 8+ hours. The full experience commitment is 10-14 hours including aftereffects. Food intake will be minimal. Adequate hydration is important given dehydration sensation and excessive sweating.
Modeled from the effect's dose-dependence curve — not per-substance measurements.
Geometry · Visual breathing · Touch enhancement · Depth perception distortion · Tracers · Perspective distortion · Auditory enhancement · Environmental patterning · Light sensitivity · Visual morphing · Symmetrical texture repetition · After-images · Peripheral vision distortion · Sound sensitivity · Visual melting · Synesthesia · Visual acuity enhancement · Visual diffraction · Auditory distortion · Holotropic state · Proprioceptive distortion · Spatial disorientation · Visual haze / noise · Auditory misinterpretation · Dreaming enhancement · Vestibular distortion · Object transformations · Flashbacks · Internal hallucinations · External hallucinations · Object activation · Visual recursion · Environmental orbism / cubism · Auditory hallucinations · Persisting hallucinations
Tracers · Perspective distortion · Auditory enhancement · Environmental patterning · Light sensitivity · Visual morphing · Symmetrical texture repetition · After-images · Peripheral vision distortion · Sound sensitivity · Visual melting · Synesthesia · Visual acuity enhancement · Visual diffraction · Auditory distortion · Holotropic state · Proprioceptive distortion · Spatial disorientation · Visual haze / noise · Auditory misinterpretation · Dreaming enhancement · Vestibular distortion · Object transformations · Flashbacks · Internal hallucinations · External hallucinations · Object activation · Visual recursion · Environmental orbism / cubism · Auditory hallucinations · Persisting hallucinations
Body high · Insomnia · Stimulation · Spontaneous body sensations · Nausea · Dry mouth · Dehydration sensation · Heart rate perception changes · Laughter fits · Physical fatigue · Restlessness · Tactile euphoria · Tingling / electric sensations · Sexual arousal enhancement · Excessive sweating · Muscle tension · Dizziness · Vibrations / buzzing · Increased urination · Bruxism · Involuntary body movements · Temperature dysregulation · Body schema distortion · Headache · Trembling · Vomiting · Abnormal heartbeat · Diarrhea · Salivation · Motor control enhancement · Seizure threshold reduction · Tactile hallucination
Spontaneous body sensations · Nausea · Dry mouth · Dehydration sensation · Heart rate perception changes · Laughter fits · Physical fatigue · Restlessness · Tactile euphoria · Tingling / electric sensations · Sexual arousal enhancement · Excessive sweating · Muscle tension · Dizziness · Vibrations / buzzing · Increased urination · Bruxism · Involuntary body movements · Body schema distortion · Headache · Trembling · Vomiting · Abnormal heartbeat · Diarrhea · Salivation · Motor control enhancement · Seizure threshold reduction · Tactile hallucination
Aesthetic enhancement · Openness enhancement · Cognitive euphoria · Immersion enhancement · Pattern recognition enhancement · Cognitive flexibility · Introspection enhancement · Confusion · Thought acceleration · Increased nature relatedness · Multiple thought streams · Analysis enhancement · Creativity enhancement · Memory suppression · Humor enhancement · Cognitive fatigue · Cognitive impairment · Synchronicity · Thought loops · Memory fragmentation · Thought disorganization · Cognitive dysphoria
Pattern recognition enhancement · Cognitive flexibility · Introspection enhancement · Confusion · Thought acceleration · Increased nature relatedness · Multiple thought streams · Analysis enhancement · Creativity enhancement · Memory suppression · Humor enhancement · Cognitive fatigue · Cognitive impairment · Synchronicity · Thought loops · Memory fragmentation · Thought disorganization · Cognitive dysphoria
Simultaneous emotions · Anxiety · Catharsis · Dysphoria
Sociability enhancement · Trust enhancement · Communication enhancement · Flow state · Depersonalization · Boundary dissolution · Ego dissolution · Identity alteration
Depersonalization · Boundary dissolution · Ego dissolution · Identity alteration
Timeline
Gradual awareness of altered state emerges. Initial body sensations — stomach awareness, mild tension, slight restlessness — precede any perceptual changes.
Intensity builds steadily with increasing body load — nausea, trembling, and muscle tension rise. Early color enhancement and visual shifts begin. Bruxism may appear.
Full psychedelic effects — vivid closed-eye geometry with jewel-like imagery, color enhancement, internal hallucinations, altered cognition and thought connectivity. Body load at maximum intensity.
Visual and cognitive effects gradually recede. Body load eases but residual stimulation and wakefulness persist. Appetite may begin to return.
Residual mood shift with mild stimulation and possible physical fatigue. Cognitive baseline slowly returns.
⚠ Do not drive or operate machinery for at least 14 hours after oral ingestion.
Safety[edit]
- Acute toxicity
- Low
- Chronic toxicity
- No data
- Withdrawal
- None
- Tolerance buildup
- rapid
- Tolerance reset
- 7 days
- Physical
- None
- Psychological
- Negligible
- Compulsive redosing
- Negligible
- Dose escalation
- Negligible
- Cross-tol.
- LSD · psilo · mesc
Toxicity
No lethal dose has been established for 3C-E in any species. No overdose cases or fatalities have been attributed to it in the published literature.safety citation needed The absence of case reports reflects the compound's rarity — not evidence that it is safe.
Body load
The most consistently reported adverse effect is significant physical discomfort. Shulgin described pre-nausea sensations, trembling, and general body discomfort at 60 mg, concluding the compound is "for most subjects a little too heavy on the body."[3] Bruxism was noted at 40 mg.
Cardiovascular effects
No cardiovascular data specific to 3C-E exist. Serotonergic phenethylamine psychedelics as a class raise heart rate and blood pressure and constrict blood vessels.[12] These effects are expected with 3C-E but have not been measured. inferred
Hyperthermia
Overheating is a class-level concern for serotonergic psychedelics, especially at higher doses or when combined with physical exertion or high ambient temperature.[12] No temperature data have been recorded for 3C-E.
Psychological Risks
The primary acute risks are anxiety, panic, and confusion — dose-dependent and shaped by setting. Higher doses can produce paranoia and disordered thinking in predisposed individuals. The 8–12 hour duration extends the window of vulnerability compared to shorter-acting psychedelics.
Shulgin's records show a steep escalation between 40 and 60 mg: manageable effects with a strong sense of control at the lower amount, high intensity with significant body and perceptual load at the higher.[3] Persistent visual disturbances — patterns or trails lasting days — are reported rarely across the psychedelic class[13] but none have been attributed to 3C-E.
Tolerance & Dependence
3C-E is not habit-forming and does not produce physical dependence. Serotonergic psychedelics are not reinforcing in animal self-administration models, and tolerance develops within 24 hours of a single dose with cross-tolerance across the psychedelic class.[4]
Repeated mescaline administration in animals did not produce the downregulation seen with LSD[11] — whether 3C-E follows the mescaline or indole psychedelic pattern is unknown. inferred No physical dependence, withdrawal, or compulsive use patterns have been reported for 3C-E or any 3C-series compound.
Drug Interactions
Serotonergic combinations
Tramadol combined with 3C-E is classified as dangerous. Tramadol blocks serotonin reuptake; adding direct serotonin receptor activation can trigger serotonin syndrome — a life-threatening response involving high fever, agitation, and rigid muscles.[14]
MAOIs slow the breakdown of serotonin, which can dramatically amplify and unpredictably extend 3C-E's effects. Although 3C-E does not itself release monoamines,[8] this combination warrants extreme caution. safety citation needed
SSRIs and SNRIs may reduce psychedelic effects through receptor downregulation with chronic use. Acute combination increases overall serotonergic activity; clinical significance for 3C-E is uncharacterized. inferred
Seizure risk
Lithium combined with serotonergic psychedelics has been associated with seizures across the class. This combination is classified as dangerous. safety citation needed
Metabolic interactions
CYP2D6 inhibitors — including fluoxetine, paroxetine, bupropion, and quinidine — may slow the breakdown of 3C-E, prolonging its already-extended duration.[10] This is inferred from related compound data and has not been confirmed directly. inferred
Cannabis
The interaction between cannabis and 3C-E has not been characterized. Cannabis may intensify anxiety and perceptual effects during psychedelic experiences.
Contraindications
No 3C-E-specific contraindication data exist. The following are inferred from the serotonergic psychedelic class inferred:
- Personal or family history of psychotic disorders: Serotonin receptor agonists may trigger or worsen psychotic episodes in predisposed individuals.
- Current lithium therapy: Seizure risk when combined with serotonergic psychedelics.
- Current MAOI therapy: Risk of potentiated serotonergic effects and unpredictable intensity.
- Severe heart conditions: Elevated heart rate and blood pressure expected with phenethylamine psychedelics.[12]
- Pregnancy: No reproductive toxicity data exist; standard precautionary exclusion applies.
- Seizure disorders: Phenethylamine psychedelics may lower seizure threshold at high doses.[12]
Harm Reduction[edit]
Forms & Identification
3C-E circulates almost exclusively as a white crystalline powder (the hydrochloride salt), visually indistinguishable from dozens of other research chemicals. Without reagent testing and a milligram-capable scale, there is no way to confirm identity or dose from appearance alone.
The dose-response curve between 40 and 60 mg is steep. Milligram accuracy is critical — eyeballing or volumetric estimation introduces serious risk with this compound.
Guidelines
- Weigh every dose on a milligram-capable scale (±2 mg accuracy or better). The difference between a moderate and overwhelming experience is 20 mg.
- Start at the low end of the active range (30 mg) when trying a new batch or using the compound for the first time.
- Allow at least 2 hours before considering the experience sub-threshold — redosing before full onset can push total exposure into uncomfortable territory.
- Eat lightly 2–3 hours before dosing to reduce nausea without slowing absorption excessively.
- Choose a physically comfortable, temperature-controlled environment. Body load is the dominant adverse feature and is worsened by physical stress.
- Have a trusted, sober companion present, especially above 40 mg. The 8–12 hour duration makes this a significant time commitment.
- Keep water accessible throughout. Maintain normal hydration without overdrinking.
Aftercare & Integration
The extended duration and heavy body load of 3C-E often leave people physically drained. Plan for a full rest day following a session. Sleep may be difficult in the final hours; a dark, quiet environment without screens helps.
Journaling within 24–48 hours captures detail that fades quickly. For experiences that were emotionally intense or psychologically challenging, talking with a trusted friend or a therapist experienced with psychedelic integration can help contextualize what emerged. Persistent distress, intrusive imagery, or perceptual changes lasting more than a few days warrant professional consultation.
Recovery & Support
3C-E does not produce physical dependence, and compulsive use patterns are not characteristic of the psychedelic class. If psychedelic use is becoming a pattern of avoidance — a way to escape rather than explore — that pattern itself may benefit from examination.
Resources for support include the Fireside Project (62-FIRESIDE / 623-473-7433), a psychedelic peer support line, and MAPS integration therapist directories. For broader substance use concerns, SAMHSA's National Helpline (1-800-662-4357) provides free referrals.
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognizing an emergency:
- Severe, uncontrollable vomiting or inability to keep fluids down
- Chest pain, racing heartbeat that feels irregular, or difficulty breathing
- Seizure activity or loss of consciousness
- Self-harm behavior or complete disconnection from reality
- Body temperature noticeably elevated to the touch
Immediate steps:
- 1. Move the person to a cool, quiet space.
- 2. If conscious, reassure them calmly and help them find a comfortable position.
- 3. Do not restrain them unless they are in immediate danger of harming themselves.
- 4. If they are unconscious, place them in the recovery position (on their side, airway clear).
- 5. Call emergency services if any of the red flags above are present.
What to tell the dispatcher:
Name the substance (3C-E, a psychedelic amphetamine), approximate dose, time of ingestion, and current symptoms. Good Samaritan laws in many jurisdictions protect people who call for help during a drug emergency.
Legal Status[edit]
3C-E is not named in most drug schedules. Whether it is illegal depends on structural analog provisions, blanket psychoactive substance bans, or new psychoactive substance frameworks in each jurisdiction.
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| United States | Not specifically scheduled | Potentially prosecutable under the Federal Analogue Act (21 U.S.C. § 813) as a structural and pharmacological analog of mescaline (Schedule I). Prosecution requires proof of intent for human consumption.[5] |
| United Kingdom | Illegal | Prohibited under the Psychoactive Substances Act 2016, which bans production, supply, and possession with intent to supply of any psychoactive substance not specifically exempted.[5] |
| Germany | Controlled (NpSG) | Scheduled under the Neue-psychoaktive-Stoffe-Gesetz (NpSG), effective November 26, 2016. Possession is prohibited but not penalized; production, import, distribution, and administration are criminal offenses.[5] |
| Canada | Unconfirmed for 3C-E | Mescaline is Schedule III under the Controlled Drugs and Substances Act (CDSA). Analog status of 3C-E under Canadian law could not be confirmed in available sources.citation needed |
| Australia | Unconfirmed for 3C-E | Mescaline is Schedule 9 (Prohibited Substance) under the Poisons Standard. 3C-E likely falls under analog provisions but specific scheduling could not be confirmed.citation needed |
Analog act considerations
In the United States, the Federal Analogue Act can extend Schedule I controls to substances structurally or pharmacologically similar to a scheduled compound when intended for human consumption. 3C-E meets both tests as a mescaline analog that activates the same serotonin receptor system. Labeling as "not for human consumption" does not reliably provide legal protection — this defense has been challenged in federal prosecutions.
Legal status changes frequently and varies by jurisdiction. This information is not legal advice. Verify current local laws before obtaining or using this substance.
references
- [1]
- [2]
- [3]
- [4] ^abde la Fuente Revenga M, Jaster AM, McGinn J, Silva G, Saha S, Gonzalez-Maeso J (2022) Tolerance and Cross-Tolerance among Psychedelic and Nonpsychedelic 5-HT2A Receptor Agonists in Mice — ACS Chemical Neuroscience doi:10.1021/acschemneuro.2c00170
- [5]
- [6] ^Parrish JC, Braden MR, Gundy E, Nichols DE (2005) Differential phospholipase C activation by phenylalkylamine serotonin 5-HT2A receptor agonists — Journal of Neurochemistry PMID:16277614