N-Ethylnorpentylone
N-Ethylnorpentylone (ephylone, N-ethylpentylone) is a synthetic cathinone stimulant of the methylenedioxy-substituted series, the N-ethyl homologue of pentylone. It spread widely as an adulterant sold as 'MDMA' or in mislabelled products and has been implicated in mass-overdose events. Human pharmacology is largely uncharacterised; reported effects are anecdotal and describe a long, stimulating, entactogen-like profile with severe redose pressure.
01 Overview
N-Ethylnorpentylone is a methylenedioxy cathinone sold as a 'research chemical' and frequently misrepresented as MDMA. Users report stimulation with mild entactogenic colour but a long duration and heavy, compulsive redosing that has driven clusters of hospitalisations.
The class hazards apply in full and are compounded by its long duration: compulsive redosing, cardiovascular strain, severe insomnia, harsh comedown and unknown neurotoxicity. There are no controlled human studies, so figures are approximate and drawn from user reports and case data.
02 Mechanism
Monoamine reuptake inhibitor at dopamine, noradrenaline and serotonin transporters, with the methylenedioxy group adding weak entactogen-like serotonergic character.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Common | 30–100 mg | Insufflated | Faster, harsher, highly compulsive. |
| Common | 50–150 mg | Oral | Anecdotal; long duration, easy to redose dangerously. |
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| StimulationStrong, long-lasting energy and wakefulness. | Anecdotal | ||
| Mild entactogenesisSome sociability and mood lift, weaker than MDMA. | Anecdotal | ||
| Appetite suppressionReduced hunger during the long active period. | Anecdotal |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Compulsive redosingStrong urge to redose despite a long duration, driving dangerous stacking. | Severe | Most users | Anecdotal | |
| Severe insomniaWakefulness lasting a day or more after use. | Moderate | Most users | Anecdotal | |
| Cardiovascular strainSustained tachycardia, hypertension and hyperthermia reported in overdose clusters. | Severe | Common | Unconfirmed |