Alpha-pyrrolidinohexiophenone (A-PHP, α-PHP) is a synthetic stimulant of the cathinone and pyrrolidine chemical classes, closely related to A-PVP (flakka) and MDPV. It belongs to a family of novel psychoactive substances characterized by their beta-ketone modification of the phenethylamine backbone and the addition of a pyrrolidine ring at the nitrogen position, making them unusually potent reuptake inhibitors of dopamine and norepinephrine.
A-PHP produces intense stimulant effects — powerful euphoria, heightened alertness, markedly reduced appetite, and elevated energy — through a mechanism believed to closely mirror that of A-PVP: potent norepinephrine-dopamine reuptake inhibition (NDRI) without significant monoamine release. This pharmacological profile, similar to cocaine but longer-lasting and more potent on a milligram basis, underlies both the substance's appeal and its substantial compulsive potential. Unlike entactogenic cathinones such as butylone or ethylone, A-PHP lacks meaningful serotonergic activity and produces little empathogenic quality.
Community experience with A-PHP is dominated by two recurring themes: its utility as a functional stimulant at controlled doses, and the near-universal account of compulsive redosing when dose discipline breaks down. One community member's account of watching a partner become consumed by pyrrolidine cathinone addiction stands as a stark harm reduction narrative. Another user's account of the "comedown nobody warns about" — extended sleep deprivation, dysphoria, and anxiety — underscores the cost of binge use. A-PHP is typically vaporized or insufflated, both routes producing rapid onset and brief peak effects that drive the redosing cycle.
A-PHP carries all the risks common to potent dopaminergic stimulants — cardiovascular stress, hyperthermia, sleep disruption, paranoia — amplified by the short duration that encourages continuous redosing. Extended use sessions frequently result in stimulant psychosis indistinguishable from paranoid schizophrenia. This substance should be approached with extreme caution; its compelling hedonic properties and compulsive redosing profile make it one of the higher-risk research chemicals in the stimulant class.
Safety at a Glance
High Risk- Test Your Substance
- A-PHP is a research chemical sold in an unregulated market where misrepresentation is common. Reagent testing is esse...
- Toxicity: Cardiovascular Risk A-PHP produces potent sympathomimetic cardiovascular effects via norepinephrine reuptake inhibiti...
- Dangerous with: 25x-NBOH, 25x-NBOMe, Atropa belladonna, Datura, MDMA (+3 more)
- Overdose risk: Overdose and Medical Emergencies Alpha-pyrrolidinohexiophenone (A-PHP) is a potent synthetic cath...
If someone is in crisis, call 911 or Poison Control: 1-800-222-1222
Dosage
insufflated
oral
smoked
Duration
insufflated
Total: 2 hrs – 5 hrsoral
Total: 2 hrs – 8 hrssmoked
Total: 2 hrs – 5 hrsHow It Feels
The onset of smoked or vaporized A-PHP is immediate and ferocious. Within seconds of exhaling, a massive surge of euphoria detonates in the chest and radiates outward through the body. The rush is overwhelming: a blast of pure dopaminergic pleasure that saturates every nerve with electric warmth. Heart rate spikes, pupils blow wide open, and there is an instantaneous sense of power, clarity, and irresistible confidence. The intensity of the initial rush is frequently described as among the most pleasurable sensations achievable through any substance, and it is this extreme reward that makes A-PHP extraordinarily compulsive.
At the peak, which arrives almost immediately and lasts perhaps fifteen to thirty minutes, the experience is defined by absolute euphoria and a frantic, driven energy. Thoughts race with grandiose confidence. The desire to move, talk, plan, and create is overwhelming, though the actual output is often scattered and incoherent. Sexually, arousal can become intense and consuming. Music sounds incredible but attention is too fractured to sit still and listen. The body buzzes and vibrates with stimulation. Physical side effects are pronounced: the heart pounds, blood pressure soars, the jaw grinds, the hands tremble, and sweating is profuse. But in the grip of the euphoria, these signals are disregarded entirely.
The crash arrives with devastating speed. Within thirty to forty-five minutes of the initial dose, the euphoria collapses and is replaced by a gnawing, hollow craving that borders on physical pain. The contrast between the peak and the valley is so extreme that redosing becomes almost reflexive. This cycle of intense rush followed by rapid crash and compulsive redosing is the central danger of A-PHP. Sessions can extend for hours or days as the user chases diminishing returns, each redose producing less euphoria and more side effects: paranoia, tremors, cardiovascular strain, and a creeping psychosis that can include auditory hallucinations and delusional thinking.
When the session finally ends, whether by choice or exhaustion of supply, the comedown is severe. Profound exhaustion, deep depression, paranoia, and physical depletion mark the hours and days that follow. Sleep may be impossible for some time despite total exhaustion. Appetite, absent for the duration, returns voraciously. The psychological residue, a combination of shame, anxiety, and the vivid memory of how good the rush felt, can persist for days and constitutes a powerful driver of repeated use.
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(18)
- Abnormal heartbeat— Abnormal heartbeat (arrhythmia) is any deviation from the heart's normal rhythm — including beats th...
- Appetite suppression— A distinct decrease in hunger and desire to eat, ranging from reduced interest in food to complete d...
- 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...
- Dry mouth— A persistent, uncomfortable reduction in saliva production causing the mouth and throat to feel parc...
- 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 heart rate— A noticeable acceleration of heartbeat that can range from a subtle awareness of one's pulse to a fo...
- Increased libido— A marked enhancement of sexual desire, arousal, and sensitivity to erotic stimuli that can range fro...
- Mouth numbing— Mouth numbing is a localized loss of sensation in the tongue, gums, cheeks, and surrounding oral tis...
- Nystagmus— Rapid, involuntary oscillating movements of the eyes that cause vision to vibrate and blur, often ma...
- Physical euphoria— An intensely pleasurable bodily sensation that can manifest as waves of warmth, tingling electricity...
- Seizure— Uncontrolled brain electrical activity causing convulsions and loss of consciousness -- a life-threa...
- 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...
- Tremors— Involuntary rhythmic shaking of the hands, limbs, or body, ranging from fine tremor to gross shaking...
- Vasoconstriction— A narrowing of blood vessels throughout the body that produces sensations of cold extremities, tingl...
- Vibrating vision— Vibrating vision is the subjective experience of the visual field rapidly oscillating or shaking due...
Tactile(2)
- Tactile enhancement— The sense of touch becomes dramatically heightened, making physical contact feel intensely pleasurab...
- Tactile hallucination— Tactile hallucinations are convincing physical sensations experienced without any corresponding exte...
Cognitive & Perceptual Effects
Visual(3)
- Brightness alteration— Perceived increase or decrease in environmental brightness beyond actual illumination levels, common...
- Drifting— The visual experience of perceiving stationary objects, textures, and surfaces as appearing to flow,...
- Visual acuity suppression— Vision becomes blurred, indistinct, and out of focus, as though looking through a smudged lens. Fine...
Cognitive(22)
- 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...
- Cognitive euphoria— A cognitive and emotional state of intense well-being, elation, happiness, and joy that manifests as...
- Cognitive fatigue— Mental exhaustion and difficulty sustaining thought after intense cognitive experiences, common duri...
- Compulsive redosing— An overwhelming, difficult-to-resist urge to continuously take more of a substance in order to maint...
- Delusion— A delusion is a fixed, false belief that is held with unshakeable certainty and is impervious to con...
- Depression— A persistent state of low mood, emotional numbness, hopelessness, and diminished interest or pleasur...
- Disinhibition— A marked reduction in social inhibitions, self-consciousness, and behavioral restraint that manifest...
- Ego inflation— Grandiose overconfidence and inflated self-importance, opposite of ego death, commonly produced by s...
- Empathy enhancement— A state of intensified compassion and emotional openness in which one feels deeply connected to othe...
- Feelings of impending doom— Feelings of impending doom is the sudden onset of an overwhelming, visceral certainty that something...
- Focus enhancement— An enhanced ability to direct and sustain attention on a single task or stimulus with unusual clarit...
- Immersion enhancement— A heightened capacity to become fully absorbed and engrossed in external media such as music, films,...
- Irritability— Irritability is a sustained state of emotional reactivity in which the threshold for annoyance, frus...
- Motivation enhancement— A heightened sense of drive, ambition, and willingness to accomplish tasks, making productive effort...
- Motivation suppression— Motivation suppression is a state of diminished drive and willingness to engage in goal-directed beh...
- Paranoia— Irrational suspicion and belief that others are watching, plotting against, or intending harm toward...
- 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 deceleration— The experience of thoughts occurring at a markedly reduced pace, as if the mind has been placed into...
- 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(3)
- Auditory distortion— Auditory distortion is the experience of sounds becoming warped, pitch-shifted, flanged, or otherwis...
- 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(1)
- Scenarios and plots— Scenarios and plots are the narrative structures that emerge within hallucinatory states — coherent ...
Pharmacology
Mechanism of Action
A-PHP's mechanism of action is not fully characterized in the scientific literature, but it is believed to act primarily as a potent norepinephrine-dopamine reuptake inhibitor (NDRI) based on its structural similarity to A-PVP and MDPV. Like other pyrrolidine cathinones, it likely functions by binding to the dopamine transporter (DAT) and norepinephrine transporter (NET), blocking the reuptake of dopamine and norepinephrine from the synaptic cleft back into the presynaptic neuron.
Critically, A-PHP is not believed to be a transporter substrate — meaning it does not cause active neurotransmitter release in the manner of amphetamine or methcathinone. This distinction is pharmacologically significant: rather than flooding synapses with newly synthesized neurotransmitter, it prolongs the action of dopamine and norepinephrine already present. This mechanism is more similar to cocaine (which is also primarily a reuptake inhibitor) than to amphetamine.
Serotonergic Activity
Unlike entactogenic cathinones in the MDxx family (butylone, ethylone, methylone), A-PHP appears to have minimal serotonin transporter (SERT) activity. This explains the absence of the empathogenic and emotional qualities associated with MDMA-like cathinones, and the more purely stimulant/euphoric character of the experience.
Pharmacokinetics
A-PHP is significantly more potent by weight than amphetamine-class stimulants. Active doses are typically in the low milligram range. When vaporized, onset is within seconds and peak effects occur within 1–3 minutes; when insufflated, onset is 2–5 minutes. Duration of peak effects is notably short — 30–60 minutes — which is a primary driver of the compulsive redosing pattern. Total duration including residual stimulation is 2–4 hours per administration.
Tolerance and Dependence
Tolerance develops rapidly with repeated dosing, often within a single session. The brief duration combined with rapid tolerance development creates a pharmacological pressure toward dose escalation and binge use. The dopaminergic rebound following cessation of high-dose use produces acute dysphoria, anhedonia, and fatigue that can persist for days — the neurobiological substrate of the post-binge "crash."
Detection Methods
Standard Drug Panel Inclusion
Alpha-PHP is a substituted cathinone (synthetic cathinone) that is not included on standard 5-panel or 10-panel immunoassay drug screens. Some extended panels (particularly those marketed for "bath salts" detection) may include cross-reactive antibodies for the cathinone class, but coverage is inconsistent. The structural relationship to amphetamine means some cathinones trigger the amphetamine channel on immunoassays, but this is compound-specific and unreliable for Alpha-PHP.
Urine Detection
Alpha-PHP and its metabolites can typically be detected in urine for 2 to 4 days following a single dose. Repeated or binge-pattern use may extend this window to 5 or more days. Primary metabolic pathways involve reduction of the beta-keto group, N-dealkylation, and hydroxylation. The resulting metabolites are excreted renally, often as glucuronide or sulfate conjugates.
Blood and Saliva Detection
Blood detection windows for Alpha-PHP range from 12 to 48 hours depending on dose and individual metabolism. Plasma concentrations decline rapidly due to extensive distribution into tissues. Oral fluid testing can detect Alpha-PHP for approximately 24 to 48 hours but is not commonly deployed for synthetic cathinones outside of specialized forensic settings.
Hair Follicle Detection
Hair analysis can detect synthetic cathinones including Alpha-PHP for up to 90 days. Incorporation into the hair shaft follows standard pharmacokinetic principles for basic amines. However, most commercial hair testing panels do not specifically target Alpha-PHP, requiring custom LC-MS/MS methods with appropriate reference standards.
Confirmatory Testing
Definitive identification of Alpha-PHP requires instrumental analysis. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is the preferred method for synthetic cathinones due to their thermal lability, which can cause degradation during gas chromatography. GC-MS remains usable but may require derivatization for optimal sensitivity. Reference standards specific to Alpha-PHP are necessary for quantitative confirmation.
Reagent Testing
Marquis reagent typically produces no reaction or a faint yellow-orange color with Alpha-PHP. Mecke reagent may show no significant color change. Mandelin reagent can produce a yellow to brown reaction. The lack of strong, characteristic color reactions with common reagents makes cathinone identification by reagent testing alone unreliable. A combination of Marquis, Mecke, Mandelin, and Simon's reagents can help rule out other substance classes but cannot positively confirm Alpha-PHP.
Interactions
| Substance | Status | Note |
|---|---|---|
| 25x-NBOH | Dangerous | — |
| 25x-NBOMe | Dangerous | — |
| Atropa belladonna | Dangerous | Extreme cardiovascular strain from anticholinergic and stimulant effects combined |
| Datura | Dangerous | Extreme cardiovascular strain from anticholinergic and stimulant effects combined |
| Diphenhydramine | Dangerous | Extreme cardiovascular strain from anticholinergic and stimulant effects combined |
| Harmala alkaloid | Dangerous | Risk of hypertensive crisis and serotonin syndrome; potentially fatal combination |
| Peganum harmala | Dangerous | Risk of hypertensive crisis and serotonin syndrome; potentially fatal combination |
| MDMA | Unsafe | — |
| 1,3-Butanediol | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| 25E-NBOH | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| 2C-T | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| 2C-T-2 | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| 2C-T-21 | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| Alcohol | Uncertain | — |
| Dissociatives | Uncertain | — |
History
Background and Origins
A-PHP is a member of the substituted pyrrolidine cathinone chemical family, a class of novel psychoactive substances developed through systematic modification of naturally occurring cathinone, the active stimulant alkaloid found in the khat plant (Catha edulis). The pyrrolidine cathinones — characterized by replacement of the secondary amine with a pyrrolidine ring — were first described in the scientific literature as potential pharmaceutical intermediates but gained prominence as designer drugs following the rise of online research chemical markets in the 2000s.
Relationship to A-PVP and MDPV
A-PHP is the hexanophenone homolog of A-PVP (the pentanophenone), differing by a single carbon in the ketone side chain. This structural relationship means the two compounds share a nearly identical pharmacological profile, with subtle differences in potency and duration. Both emerged as successors to MDPV following that compound's scheduling, demonstrating the cat-and-mouse dynamic between regulatory action and clandestine synthesis that defines the designer drug market.
Regulatory Status
A-PHP has been placed under regulatory control in numerous jurisdictions. In the United States, it is considered an analogue of scheduled cathinones under the Federal Analogue Act and has been explicitly scheduled in several states. Many European countries have scheduled it under blanket cathinone bans or analog legislation. Despite formal controls, it remains available through online vendors in jurisdictions with less comprehensive coverage, typically marketed as a "research chemical" or "not for human consumption."
Cultural Context
A-PHP emerged in the context of the broader "bath salts" moral panic of the early 2010s, though it postdates the peak of that media cycle. Like other members of the pyrrolidine cathinone family, its notoriety is derived primarily from documented cases of severe psychiatric sequelae — aggressive behavior, psychosis, and extreme compulsive use — that drew mainstream media attention to this class of substances.
Harm Reduction
Test Your Substance
A-PHP is a research chemical sold in an unregulated market where misrepresentation is common. Reagent testing is essential:
- Mecke reagent: cathinones typically produce a blue-green to black color
- Marquis reagent: A-PHP produces orange to brown Testing does not confirm purity or rule out multiple adulterants; use fentanyl test strips as an additional check.
Dose Extremely Carefully
A-PHP is highly potent on a milligram basis. The difference between a functional stimulant dose and an overwhelming one is measured in single milligrams:
- Use a milligram-accurate scale (0.001g precision) — volumetric dosing in solution is preferred for safety
- Start with the lowest possible dose and wait to assess effects fully before considering redosing
- If vaporizing, start with an amount smaller than you think necessary; overconsumption via this route happens very easily
The Redosing Problem
Community experience overwhelmingly identifies compulsive redosing as the defining hazard of A-PHP. Practical harm reduction strategies:
- Set a hard limit before starting: decide on a maximum total dose and maximum number of redoses before any are taken
- Use an alarm or timer: do not redose until a predetermined interval has elapsed
- Do not use alone: a trusted companion can observe escalating behavior before you notice it yourself
- Remove excess material from reach: leave only what you have decided to use; remove the rest from your immediate environment
Avoid Binge Use
Extended binge use — multiple doses over hours or days — is where the most serious harms occur. Do not use on consecutive days. Community reports document that what begins as a single session can become multi-day use with severe psychiatric and physical consequences.
Dangerous Combinations
- MAOIs — Risk of hypertensive crisis; absolutely contraindicated
- Other stimulants — Additive cardiovascular stress and psychosis risk
- Cannabis — Can trigger paranoia and intensify psychosis risk in stimulant-sensitized users
- Alcohol — Masks stimulant toxicity warning signs; increases cardiovascular risk
If Psychosis Develops
Stimulant psychosis is a medical emergency. If someone becomes paranoid, delusional, or begins hallucinating:
- Remove additional stimulants from the environment
- Move to a calm, quiet setting
- Benzodiazepines (e.g., diazepam) can help reduce acute agitation safely
- Seek emergency medical care if symptoms are severe, escalating, or the person poses a risk to themselves or others
Toxicity & Safety
Cardiovascular Risk
A-PHP produces potent sympathomimetic cardiovascular effects via norepinephrine reuptake inhibition: significant increases in heart rate and blood pressure, peripheral vasoconstriction, and potential for cardiac arrhythmia. These effects are dose-dependent and substantially intensified in binge use scenarios. Individuals with pre-existing cardiovascular disease, hypertension, or structural cardiac abnormalities face serious risk of acute cardiac events including myocardial infarction and stroke. Death from cardiovascular collapse has been reported with pyrrolidine cathinones of this class.
Hyperthermia
Like other potent dopaminergic stimulants, A-PHP can cause life-threatening hyperthermia (dangerously elevated body temperature) particularly during active physical exertion, in hot environments, or during extended binge use. Hyperthermia is a leading cause of stimulant-related fatality and can progress rapidly to rhabdomyolysis, organ failure, and death if untreated. Monitoring body temperature and maintaining a cool environment is essential.
Stimulant Psychosis
Perhaps the most clinically significant risk of A-PHP is stimulant psychosis — a state of acute paranoia, hallucinations, and disorganized thought indistinguishable from schizophrenia during the episode. Stimulant psychosis is strongly associated with binge use and sleep deprivation, both of which are common with A-PHP due to its short duration and compelling compulsive character. Community accounts document paranoid ideation, tactile hallucinations ("coke bugs"), and delusional thinking emerging after extended use sessions.
Addiction and Compulsive Use
Multiple community accounts explicitly document the extreme compulsive redosing potential of A-PHP. The short duration of peak effects combined with the intensity of the initial rush creates a powerful drive to redose before effects fade. This cycle can rapidly escalate into multi-day binge use with severe consequences for physical and mental health, relationships, and occupational function.
Neurotoxicity
While the long-term neurotoxicity profile of A-PHP specifically has not been well-characterized in humans, MDPV and related pyrrolidine cathinones have shown evidence of neurotoxic potential in animal models. Prudent caution suggests that heavy, repeated use carries unknown but potentially significant risk of lasting neurobiological changes.
Addiction Potential
highly addictive with a high potential for abuse
Overdose Information
Overdose and Medical Emergencies
Alpha-pyrrolidinohexiophenone (A-PHP) is a potent synthetic cathinone that acts as a dopamine-norepinephrine reuptake inhibitor with significant abuse potential and a narrow margin of safety. Overdose and acute toxicity represent serious medical emergencies that require immediate intervention.
Stimulant Psychosis
A-PHP is strongly associated with stimulant psychosis, particularly during binge use patterns. Symptoms include intense paranoid ideation, persecutory delusions, auditory and visual hallucinations, extreme agitation, and disorganized or aggressive behavior . Psychotic episodes may persist for hours to days after last use and are more likely with repeated dosing, sleep deprivation, and escalating doses. Unlike cocaine psychosis, synthetic cathinone-induced psychosis may be more prolonged and resistant to resolution .
Cardiovascular Emergency
Acute A-PHP toxicity produces a sympathomimetic toxidrome: severe tachycardia (heart rates exceeding 150 bpm), marked hypertension, chest pain, palpitations, and diaphoresis . The most dangerous cardiovascular complications include cardiac arrhythmia, myocardial infarction, and pulmonary edema — which are among the primary causes of cathinone-related fatalities . Chest pain in the context of A-PHP use should always be treated as a potential cardiac emergency.
Hyperthermia
Hyperthermia is a critical and potentially lethal complication of A-PHP overdose. Core body temperatures can rise above 40 degrees C (104 degrees F), triggering a cascade of rhabdomyolysis, disseminated intravascular coagulation, renal failure, and multi-organ dysfunction . Environmental factors (hot settings, physical exertion) dramatically increase risk.
The Binge-Crash Cycle
A-PHP's short duration of action (1-3 hours) and intensely reinforcing properties promote compulsive re-dosing and extended binge sessions. Users may consume dozens of doses over 24-72 hours, progressively escalating amounts as acute tolerance develops . The subsequent crash involves extreme exhaustion, depression, anhedonia, and intense cravings — frequently triggering another binge cycle.
When to Seek Emergency Care
Seek immediate emergency medical attention for: chest pain or pressure, heart rate above 150 bpm, body temperature above 39.5 degrees C (103 degrees F), seizures, loss of consciousness, severe agitation or psychosis with violent behavior, difficulty breathing, or dark-colored urine (a sign of rhabdomyolysis) .
References
Zawilska JB, Wojcieszak J. alpha-Pyrrolidinohexanophenone (alpha-PHP) and alpha-Pyrrolidinoisohexanophenone (alpha-PiHP): A Review. Life (Basel). 2024;14(4):429. Prosser JM, Nelson LS. The toxicology of bath salts: a review of synthetic cathinones. Journal of Medical Toxicology. 2012;8(1):33-42.
Dangerous Interactions
The combinations listed below may be life-threatening. Independent research should always be conducted to ensure safety when combining substances.
Extreme cardiovascular strain from anticholinergic and stimulant effects combined
Extreme cardiovascular strain from anticholinergic and stimulant effects combined
Extreme cardiovascular strain from anticholinergic and stimulant effects combined
Risk of hypertensive crisis and serotonin syndrome; potentially fatal combination
Risk of hypertensive crisis and serotonin syndrome; potentially fatal combination
Tolerance
| Full | develops with prolonged and repeated use |
| Half | 3 - 7 days |
| Zero | 1 - 2 weeks |
Cross-tolerances
Legal Status
International Legal Status
Alpha-pyrrolidinohexiophenone (A-PHP) has been placed under international and domestic drug control in numerous jurisdictions following its emergence on designer drug markets.
International (United Nations): A-PHP was placed inSchedule II of the Convention on Psychotropic Substances in 2020 following recommendation by the WHO Expert Committee on Drug Dependence, making it subject to international control obligations for all UN member states .
United States: The DEA placed A-PHP inSchedule I of the Controlled Substances Act effective August 1, 2022, classifying it as having high abuse potential, no currently accepted medical use, and a lack of accepted safety under medical supervision . Prior to specific scheduling, it was subject to the Federal Analogue Act.
United Kingdom: Controlled as aClass B substance under the Misuse of Drugs Act 1971, via the generic cathinone definition that covers pyrovalerone analogues .
Netherlands: Banned as of October 29, 2021, under the implementation of the 1971 Vienna Convention obligations following the UN scheduling decision .
Germany: Controlled under theNeue-psychoaktive-Stoffe-Gesetz (NpSG) as a cathinone derivative, and subsequently reinforced by the UN Schedule II listing .
Portugal: Controlled since May 2021 following the UN scheduling decision entering domestic legislation .
Other jurisdictions: Specifically scheduled in Sweden, Hungary, Japan, and China. As a UN Schedule II substance since 2020, all 186 parties to the Convention on Psychotropic Substances are obligated to implement domestic controls, though implementation timelines vary .
References
UNODC. Substance Details: alpha-PHP. Early Warning Advisory on New Psychoactive Substances. Federal Register. Schedules of Controlled Substances: Placement of alpha-Pyrrolidinohexanophenone in Schedule I. 87 FR 32858. 2022. Misuse of Drugs Act 1971. UK Public General Acts. c.38. Neue-psychoaktive-Stoffe-Gesetz (NpSG). Bundesgesetzblatt. 2016.
Experience Reports (2)
Tips (10)
Pyrrolidine stimulants like A-PHP can rapidly destroy relationships. Paranoia, verbal aggression, and erratic behavior are common with repeated use. If people close to you are expressing concern, listen to them.
A-PHP is extremely compulsive to redose, especially when vaped. Set a strict limit on the amount you take out for a session and lock the rest away. Many users report binges spiraling out of control within hours.
Have a benzodiazepine or sedative on hand before starting an A-PHP session. The comedown can involve severe anxiety, paranoia, and insomnia. Landing gear is not optional with pyrrrolidine stimulants.
Monitor your heart rate and blood pressure when using A-PHP. Sustained elevated cardiovascular stress causes cumulative damage. If you experience chest pain, irregular heartbeat, or numbness in extremities, seek medical attention.
Test A-PHP with appropriate reagent kits and fentanyl test strips. Stimulant supplies have increasingly been found contaminated with fentanyl, which has caused a surge in overdose deaths among stimulant users.
Start low with A-PHP and wait for full onset before redosing. Stimulant redosing extends duration and side effects more than it extends euphoria, while adding cardiovascular strain. Set a firm limit before you start.
Community Discussions (4)
See Also
References (3)
- Amphetamine: new content for an old topic — Heal et al. Neuropsychopharmacology Reviews (2013)paper
- A-PHP - TripSit Factsheet
TripSit factsheet for A-PHP
tripsit - A-PHP - Wikipedia
Wikipedia article on A-PHP
wikipedia