5F-AKB48
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5F-AKB48 (5F-APINACA) is a synthetic cannabinoid of the indazole-3-carboxamide class. It is the fluorinated structural analog of AKB48, with greater potency and longer-lasting activity in the body.[1] It activates cannabinoid receptors in the brain with full force, overriding the body's natural endocannabinoid system.[2]
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The compound originates from a Pfizer patent on cannabinoid-based pain suppression; clandestine chemists adopted the scaffold after earlier synthetic cannabinoids were banned.[3] The fluorinated version appeared after the parent was controlled, first identified in South Korea and circulating as "herbal incense" from around 2013 to 2017.[4][5] Largely displaced by newer compounds, it re-emerged as a public health concern in France as of 2025.[6]
Subjective effects include euphoria, relaxation, appetite enhancement, altered time perception, and sedation. The experience resembles an intensified, compressed version of cannabis — stronger and markedly shorter — with a steep shift from pleasant effects to agitation and paranoia at higher doses.[7] Rapid heart rate, disorientation, nausea, and anxiety are common unwanted effects.
5F-AKB48 produces moderate physical and psychological dependence,[2] and no lethal dose has been established in any species. Full cannabinoid receptor agonism creates a narrow gap between desired and dangerous effects; documented cardiac channel inhibition adds heart rhythm risks that compound with certain medications.[8] No controlled human studies exist — current understanding rests on animal data, forensic casework, and poison center reports.
History[edit]
Discovery
The APINACA scaffold originated from a Pfizer patent on cannabinoid-based pain suppression.[3] Clandestine chemists adopted it after earlier synthetic cannabinoids were scheduled. The parent compound APINACA (AKB48) was first identified by Japanese forensic labs in March 2012,[4][2] with the fluorinated structural analog 5F-AKB48 following shortly after, first identified in South Korea.[5]
Market trajectory
5F-AKB48 circulated primarily as "herbal incense" between 2013 and 2017. Adding a fluorine atom to the end of the pentyl chain boosted potency and temporarily sidestepped scheduling language.[3][9] Germany controlled it as early as July 2013,[5] with widespread international scheduling following in 2016–2017.
Scheduling and modern status
The WHO recommended placing 5F-APINACA in Schedule II of the 1971 UN Convention at its 42nd meeting in 2019.[2] Newer synthetic cannabinoids then largely displaced it from illicit markets.[10] As of 2025, it has re-emerged in France through poison control records.[6]
The name "AKB48" derives from an internal laboratory code assigned during development, not from any cultural reference. In drug markets, the compound circulated under the brand names of the herbal blend products it was sprayed onto — commercial packaging typically bore fantasy names unrelated to the active ingredient. The "5F" prefix designates the terminal fluorine on the pentyl chain, a naming convention shared across the synthetic cannabinoid class (5F-ADB, 5F-AMB, 5F-MDMB-PICA) that became shorthand for a second-generation analogue designed to circumvent scheduling of the parent compound.
Chemistry[edit]
Structural class
5F-AKB48 belongs to the indazole-3-carboxamide subclass of synthetic cannabinoids. Its structure combines an indazole core, a 5-fluoropentyl chain, and an adamantyl head group — a rigid, cage-like carbon structure that confers strong cannabinoid receptor binding.[11] It differs from the parent compound APINACA (AKB48) by a single fluorine atom on the end of the pentyl chain,[4] which increases metabolic stability and potency.[1][12]
Molecular properties
| Molecular formula | C₂₃H₃₀FN₃O |
| Molecular weight | 383.5 g/mol |
The molecule has no chirality centers, so all preparations yield a single isomer[13] — unlike many newer synthetic cannabinoids, where mirror-image configuration significantly affects receptor binding.
Pharmacology[edit]
Mechanism of action
5F-AKB48 is a full agonist at CB1 and CB2 cannabinoid receptors.[1][2] THC only partially activates CB1; 5F-AKB48 drives full activation,[9] producing stronger peak effects and a narrower gap between desired effects and adverse reactions. Animal studies confirm more potent, shorter-lived cannabinoid effects than THC — reversed by a CB1 blocker.[1][14]
Active metabolite
The primary metabolite, 4OH-5F-AKB48, retains cannabinoid receptor binding and activates downstream signaling more effectively than THC.[1] An active metabolite that independently engages cannabinoid receptors can prolong and intensify both desired and harmful effects beyond the parent compound alone.
Pharmacokinetics
5F-AKB48 is metabolized primarily by a liver enzyme, CYP3A4.[12] The dominant metabolic pathway partially saturates at higher concentrations, meaning effects may not scale proportionally with dose.[15][12] In forensic impaired-driving cases, blood concentrations of 0.24–6.5 μg/L have been reported.[16]
Neuroscience[edit]
Where it acts
5F-AKB48 hijacks the endocannabinoid system — the network of receptors that fine-tunes neurotransmitter signaling throughout the brain. In the hippocampus, this disrupts memory formation, producing acute amnesia and cognitive impairment. In the amygdala, excessive activation tips paradoxically into anxiety and paranoia, explaining the dose-dependent shift from calm to fear.[7]
Why it matters
5F-AKB48 triggers prolonged dopamine release in the brain's reward center,[2] sustaining reward signaling beyond what the body's own cannabinoids produce. Repeated exposure causes cannabinoid receptors to downregulate more severely than with THC,[17] which is why synthetic cannabinoid withdrawal is harder than cannabis withdrawal.
Binding data specific to 5F-AKB48 remain unpublished, so the exact potency boost from fluorination is unquantified. The active metabolite 4OH-5F-AKB48 signals more effectively than THC at cannabinoid receptors,[1] but whether it crosses into the brain efficiently and how much it contributes to the subjective experience is unknown. The compound's inhibition of a cardiac ion channel[8] raises the question of whether this heart risk extends across the broader synthetic cannabinoid class.
Subjective Effects[edit]
The 5F-AKB48 experience is recognizably cannabis-like at lower doses — warmth, relaxation, altered perception — but compresses into a brief, high-intensity window. Full cannabinoid receptor agonism means effects escalate sharply with even small dose increases, crossing unpredictably from pleasant sedation into paranoia and disorientation.[7]
Relative to cannabis, 5F-AKB48 is qualitatively similar but more intense, shorter, and much harder to self-titrate. Concentrations in herbal products vary by orders of magnitude between and within samples,[10] making consistent dosing effectively impossible. It shares more in risk profile with other synthetic cannabinoids than with plant-derived cannabis.
Effect Grid
Full cannabinoid effects are evident — clear euphoria and cognitive euphoria, a pronounced body high, appetite enhancement, and noticeable time alteration. Sedation increases and thought deceleration becomes apparent. Analysis suppression and cognitive impairment are present, making complex tasks difficult.
Tachycardia may emerge and is the most consistently reported physical effect across clinical case series (91% in one study). Muscle relaxation is pronounced. Nausea is possible, particularly in less experienced users. Spontaneous body sensations and bodily lightness contribute to the somatic experience.
At the upper end of this range, anxiety and paranoia become increasingly likely. The transition from euphoric to anxiogenic effects can be abrupt due to full CB1 agonism. Total duration is approximately 30–60 minutes when smoked.
Modeled from the effect's dose-dependence curve — not per-substance measurements.
Visual processing suppression · Auditory hallucinations · External hallucinations · Internal hallucinations
Pain suppression · Heart rate perception changes · Muscle relaxation · Sedation · Spontaneous body sensations · Dehydration sensation · Appetite enhancement · Bodily heaviness · Nausea · Physical fatigue · Constipation · Headache · Laughter fits · Restlessness · Bodily lightness · Temperature dysregulation · Trembling · Body schema distortion · Breathing alteration · Excessive sweating · Nausea suppression · Vomiting · Involuntary body movements · Nystagmus (eye wobbles) · Bodily dissociation · Tactile hallucination
Sedation · Spontaneous body sensations · Dehydration sensation · Appetite enhancement · Bodily heaviness · Nausea · Physical fatigue · Constipation · Headache · Laughter fits · Restlessness · Bodily lightness · Trembling · Body schema distortion · Breathing alteration · Excessive sweating · Nausea suppression · Vomiting · Involuntary body movements · Nystagmus (eye wobbles) · Bodily dissociation · Tactile hallucination
Cognitive fatigue · Focus suppression · Information processing suppression · Memory suppression · Thought disorganization · Cognitive euphoria · Confusion · Language suppression · Memory fragmentation · Motivation suppression · Thought connectivity · Cognitive dysphoria · Thought loops · Conceptual thinking · Amnesia · Delusions · Delirium
Memory suppression · Thought disorganization · Cognitive euphoria · Confusion · Language suppression · Memory fragmentation · Motivation suppression · Thought connectivity · Cognitive dysphoria · Thought loops · Conceptual thinking · Delusions · Delirium
Dysphoria · Emotional lability · Irritability · Anxiety suppression · Emotional suppression
Emotional suppression
Emotional susceptibility · Sociability suppression · Social disconnection · Depersonalization · Cognitive disconnection
Cognitive disconnection
Timeline
First perceptible effects within seconds to 2 minutes of inhalation. Rapid pulmonary absorption produces a faint warmth and subtle mood shift.
Rapid escalation — body high and euphoria intensify quickly. Full agonism means the transition from threshold to peak is steep; effects may feel suddenly overwhelming.
Maximum intensity with full cannabimimetic profile — euphoria, cognitive alteration, body high, time alteration. Tachycardia, anxiety, and paranoia are most likely during this phase.
Effects diminish relatively quickly. Residual sedation and cognitive fog persist. The active metabolite 4OH-5F-AKB48 may sustain mild effects beyond parent compound clearance.
Mild residual effects — physical fatigue, appetite changes, mild cognitive fog. Generally resolved within 90 minutes of administration.
⚠ Do not drive or operate machinery for at least 2 hours after smoking 5F-AKB48; residual cognitive impairment and sedation may persist beyond subjective resolution of effects.
Safety[edit]
- Acute toxicity
- High
- Chronic toxicity
- Moderate
- Withdrawal
- Moderate
- Tolerance buildup
- moderate
- Tolerance reset
- 10.5 days
- Physical
- Moderate
- Psychological
- Moderate
- Compulsive redosing
- Moderate
- Dose escalation
- Moderate
- Cross-tol.
- cannabis · synthetic cannabinoids
Toxicity
Acute toxicity
No lethal dose has been established for 5F-AKB48 in any species, and the exact toxic dose in humans is unknown. safety citation needed
The best clinical data comes from 58 confirmed intoxication cases in Serbia: rapid heart rate occurred in 91% of patients, with dilated pupils, drowsiness, nausea, agitation, and disorientation also common.[7] All patients recovered within 8 hours with supportive care. A 2025 French study represents the largest dedicated case series,[6] and analytically confirmed cases have been documented in the UK.[18]
At high doses, effects include hypothermia, seizures, muscle jerking, chest pain, and high blood pressure.[2]
Cardiovascular toxicity
5F-AKB48 blocks a cardiac ion channel (hERG, IC50 = 2.16 μM), which can cause dangerous heart rhythm disturbances and QT prolongation.[8] Combining it with the antipsychotic olanzapine amplifies this blockade additively — a critical concern since antipsychotics are sometimes used to manage the agitation 5F-AKB48 causes.[8]
A heart attack was reported in a young man after smoking 5F-APINACA, with chest pain beginning about 4 hours after inhalation.[2] At the class level, synthetic cannabinoids are associated with blood pressure drops, slowed heart rate, stroke, and blood clot events.[19]
Kidney and systemic toxicity
Synthetic cannabinoids as a class can trigger acute kidney injury, including kidney failure caused by muscle breakdown.[20] Multiple organ failure involving the liver, kidneys, and heart has been documented.[21] No 5F-AKB48-specific isolated organ failure cases have been published, but its potency and full-agonist mechanism place it within this class-level risk.
Long-term toxicity
Prolonged use is associated with appetite suppression, cognitive impairment, breathing difficulty, heart conditions requiring medication, skin damage, tooth decay, lethargy, tremors, and insomnia.[2] Driving impairment is an established concern; 5F-APINACA has been detected in blood from impaired-driving cases.[16]
Psychological Risks
Paranoia, delusions, anxiety, and acute psychosis are commonly reported at higher doses.[7][19][9] Cognitive impairment — amnesia, disorientation, impaired judgment — is also characteristic, with prolonged use linked to persistent deficits.[2] At the class level, first-episode psychosis, prolonged paranoid states, self-harm, and suicidal ideation have been documented.[19]
The shift from calm to fear is characteristic of full CB1 agonists: moderate activation calms, excessive activation triggers paradoxical panic. Thresholds are unpredictable because concentrations in herbal products vary enormously — documented at 0.05–1.17 mg/cm² across samples, and 0.47–2.38 mg/cm² within a single seized sheet.[10]
Tolerance & Dependence
5F-AKB48 builds tolerance by downregulating cannabinoid receptors. As a full agonist, it drives this more severely than THC — consistent with harder dependence and worse withdrawal compared to cannabis.[17] Cross-tolerance develops with other cannabinoids, including cannabis and other synthetic cannabinoids.
Withdrawal brings irritability, anxiety, insomnia, appetite loss, and tremors.[17] The compound also triggers prolonged dopamine release in the brain's reward center,[2] driving compulsive use beyond the cannabinoid high alone. Both the WHO and US DEA have recognized high abuse potential as a basis for scheduling,[2][22] with the DEA citing an "imminent hazard to public safety".[22]
Drug Interactions
The most dangerous documented interaction involves a cardiac ion channel. 5F-AKB48 blocks the hERG channel (IC50 = 2.16 μM), and combining it with olanzapine produces additive blockade.[8] Any drug that prolongs the QT interval — including other antipsychotics (haloperidol, quetiapine, ziprasidone), certain antibiotics (erythromycin, fluoroquinolones), antifungals (fluconazole), antiemetics (ondansetron), and tricyclic antidepressants — carries risk of dangerous heart rhythm disturbances. No clinical interaction studies exist. safety citation needed
Because CYP3A4 is the primary metabolic enzyme,[12] inhibitors (ketoconazole, itraconazole, HIV protease inhibitors, grapefruit juice, clarithromycin) can raise blood levels and prolong effects. Inducers (rifampin, carbamazepine, phenytoin, St. John's Wort) accelerate metabolism and reduce effects. Alcohol, opioids, and benzodiazepines add sedation — a concern amplified by the respiratory depressant potential of the synthetic cannabinoid class.
Contraindications
Heart conditions: Pre-existing conduction abnormalities, long QT syndrome, or concurrent use of QT-prolonging medications are absolute contraindications given documented hERG channel inhibition (IC50 = 2.16 μM).[8] Heart disease and risk factors for heart attack are additional concerns following the reported case in a young user.[2]
Kidney impairment: The class association with acute kidney injury and muscle breakdown[20][21] makes pre-existing kidney disease a relative contraindication; reduced clearance could prolong exposure.
Psychiatric vulnerability: Pre-existing psychotic disorders or a personal or family history of psychosis are relative contraindications, given the documented capacity to precipitate acute psychosis and paranoid states.[19]
Liver impairment: CYP3A4-dependent metabolism means significant liver dysfunction could impair clearance and elevate blood levels.[12]
Pregnancy and lactation: No reproductive safety data exist for 5F-AKB48. Given full CB1 agonism and the absence of safety data, exposure during pregnancy or lactation is contraindicated. safety citation needed
Seizure disorders: Seizures are documented among high-dose adverse effects,[2] making pre-existing seizure disorders a relative contraindication.
Harm Reduction[edit]
Forms & Identification
5F-AKB48 is almost exclusively encountered as dried plant material sprayed or soaked with the compound — sold as "herbal incense," "spice," or similar branded products. The active compound is invisible; there is no way to visually distinguish sprayed from unsprayed material, or to identify which synthetic cannabinoid is present. Concentration varies dramatically between products, between batches, and within a single packet.[10]
Standard cannabis reagent tests do not reliably identify synthetic cannabinoids. Definitive identification requires laboratory analysis.[23] If a testing service is accessible, use it — knowing what is in a sample is the single most important risk-reduction step for any SCRA product.
Guidelines
- Start with the smallest possible amount. Full CB1 agonists have a narrow margin between desired effects and serious adverse reactions — there is no reliable way to predict individual response to an untested batch.
- Never use alone. The rapid onset and short duration mean impairment peaks within minutes; a sober companion can intervene during seizures, loss of consciousness, or panic.
- Do not redose during the initial experience. Effects may not plateau for several minutes after inhalation.
- Avoid all other substances, particularly alcohol, sedatives, and any medication that affects heart rhythm.
- Stay hydrated but avoid excessive water intake during acute effects.
- Have a phone accessible with emergency services available.
Set & Setting
The synthetic cannabinoid experience is less malleable than cannabis — full CB1 agonism drives pharmacological effects that largely override environmental context. Unfamiliar or stressful environments increase the likelihood of anxiety and paranoia at any dose level. A calm, controlled space with a sober companion present meaningfully reduces psychological risk, and ensures someone is available to respond if acute adverse effects occur.
Aftercare & integration. The short duration of acute effects means physical recovery is typically rapid — most users feel baseline within a few hours. Hydrate, eat when appetite returns, and prioritize sleep. Mild anxiety or irritability may persist for 12–24 hours.
If the experience involved severe anxiety, paranoia, or dissociation, talking through the event with a trusted person can prevent it from crystallizing into ongoing distress. Persistent psychological symptoms (anxiety, intrusive thoughts, depersonalization) beyond 48 hours warrant professional consultation.
Recovery & Support
Regular SCRA use produces moderate physical and psychological dependence. Withdrawal symptoms — irritability, insomnia, anxiety, appetite suppression, and tremors — typically begin within 24–48 hours of last use and may persist for one to two weeks.
Tapering with cannabis is sometimes used informally, as synthetic cannabinoids and cannabis share cross-tolerance, but this approach has not been clinically validated. Professional support through addiction services, counseling, or peer support groups (such as SMART Recovery or similar programs) provides the most reliable path to sustained discontinuation. If withdrawal symptoms are severe, medical supervision is recommended.
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognizing an emergency: chest pain, seizures, loss of consciousness, unresponsiveness, extreme confusion, or a heart rate that feels dangerously fast or irregular all require immediate medical attention. Persistent vomiting that prevents fluid intake is also a warning sign.
Immediate steps:
- 1. Call emergency services immediately if the person is unconscious, seizing, or reporting chest pain.
- 2. Place an unconscious but breathing person in the recovery position (on their side, head tilted back, airway clear).
- 3. Do not restrain a person experiencing agitation unless they pose immediate danger to themselves or others.
- 4. Do not induce vomiting — 5F-AKB48 is typically inhaled, not ingested.
- 5. Monitor breathing and heart rate continuously while waiting for help.
What to tell the dispatcher: Name the substance (synthetic cannabinoid / "spice"), approximate time of use, amount if known, and current symptoms. Good Samaritan laws in many jurisdictions protect people who call for help during a drug emergency.
Legal Status[edit]
5F-AKB48 (5F-APINACA) is internationally controlled under Schedule II of the 1971 United Nations Convention on Psychotropic Substances.[11] It has no recognized medical use and is classified as a substance of abuse in all scheduling frameworks where it appears.
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| International | Schedule II (1971 Convention) | Placed by UNODC as of 2017; recommended by WHO ECDD at 42nd meeting (2019)[11][2] |
| United States | Schedule I (CSA) | Parent AKB48 permanently scheduled 2016.[24] 5F-APINACA temporarily placed in Schedule I December 2016,[22] extended April 2019.[25] Permanent scheduling status for 5F-APINACA specifically requires editorial verification. citation needed |
| United Kingdom | Class B (Misuse of Drugs Act) + PSA 2016 | Controlled under generic synthetic cannabinoid definition; additionally covered by Psychoactive Substances Act 2016[5] |
| Germany | Anlage II (BtMG) | Controlled since July 2013; illegal to manufacture, possess, import, export, buy, or sell without license[5] |
| Australia | Controlled substance | Specific scheduling regulation not confirmed in retrieved sources[5] |
| Canada | Controlled substance | Specific scheduling regulation not confirmed in retrieved sources[5] |
| Other | Various controlled statuses | Also controlled in Czech Republic, China, Denmark, Latvia, Estonia, Moldova, and New Zealand[5] |
Legal status changes over time and varies by jurisdiction. The table above reflects the current editorial record and is not legal advice. Always verify current status in a specific jurisdiction before drawing any conclusions.
references
- [1] ^abcdefPinson A, Yarbrough AL, Bush JM, Cabanlong CV, Shoeib A, Jackson BK, Fukuda S, Gogoi J, Fantegrossi WE, McCain K, Prather PL, Fujiwara R, Radominska-Pandya A (2020) Metabolism, CB1 cannabinoid receptor binding and in vivo activity of synthetic cannabinoid 5F-AKB48: Implications for toxicity. — Pharmacology, biochemistry, and behavior doi:10.1016/j.pbb.2020.172949
- [2]
- [3] ^abcTracy DK, Wood DM, Baumeister D (2017) Novel psychoactive substances: types, mechanisms of action, and effects — BMJ doi:10.1136/bmj.i6848
- [4] ^abcGandhi AS, Zhu M, Pang S, Wohlfarth A, Scheidweiler KB, Liu HF, Huestis MA (2013) First characterization of AKB-48 metabolism, a novel synthetic cannabinoid, using human hepatocytes and high-resolution mass spectrometry. — The AAPS journal doi:10.1208/s12248-013-9516-0
- [5]
- [6] ^abcHarmel C, Caré W, Laborde-Casterot H, Liautard M, Langrand J, Dufayet L (2025) 5F-AKB48: A synthetic cannabinoid presenting an emerging public health concern in France. — The International journal on drug policy doi:10.1016/j.drugpo.2025.104972