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psx:substance/3-ho-pcp/src/doi:10.1016/j.forsciint.2016.12.028

src2026-09-24recordconsumed

derived from · upstream

none recorded

feeds · downstream

Closure of psx:substance/3-ho-pcp/src/doi:10.1016/j.forsciint.2016.12.028: 43 upstream, 85 downstream.

psx:substance/3-ho-pcp/src/doi:10.1016/j.forsciint.2016.12.028
  ├─ used  src/url:7446623ee08acd4e  3-HO-PCP - HandWiki
  ├─ used  src/pmid:2834673  Regulation of the binding of sigma- and phencyclidine (PCP)-receptor ligands in rat brain membranes by guanine nucleotides and ions
  ├─ used  src/pmid:2893238  Pharmacological specificity of some psychotomimetic and antipsychotic agents for the sigma and PCP binding sites
  ├─ used  src/url:4815d0a19d492379  3-OH-PCP 47th ECDD Critical Review (Public Version)
  ├─ used  src/doi:10.1007/s00204-020-02693-7  Designer drugs: mechanism of action and adverse effects
  ├─ used  src/doi:10.1176/appi.ajp.20240378  Redefining Ketamine Pharmacology for Antidepressant Action: Synergistic NMDA and Opioid Receptor Interactions
  ├─ used  src/pmid:1654746  Recent advances in the phencyclidine model of schizophrenia
  ├─ used  src/pmid:7620917  Quantitative autoradiographic localization of [3H]3-OH-PCP (1-(1(3-hydroxyphenyl)cyclohexyl)piperidine) binding sites in rat brain
  ├─ used  src/pmid:8884223  Autoradiographic study on the pharmacological characteristics of [3H]3-OH-PCP binding sites in rat brain
  ├─ used  src/doi:10.1002/dta.2807  In vitro and in vivo metabolism and detection of 3-HO-PCP, a synthetic phencyclidine, in human samples and pooled human hepatocytes using high resolution mass spectrometry
  ├─ used  src/doi:10.1007/s13181-019-00734-x  Severe Toxicity to the New Psychoactive Substances 3-Hydroxyphencyclidine and N-Ethylhexedrone: an Analytically Confirmed Case Report
  ├─ used  src/url:4a24ec5055100265  International Drug Scheduling; Convention on Psychotropic Substances; 3-Hydroxy-phencyclidine; Request for Comments
  ├─ used  src/doi:10.2174/1570159X14666161018151716
  ├─ used  src/url:d9e63c4e7d08f8bf  PubChem Compound Summary: 3-(1-Piperidin-1-ylcyclohexyl)phenol (CID 133277)
  ├─ used  src/doi:10.1093/schbul/sbs076  NMDA receptor and schizophrenia: a brief history
  ├─ used  src/doi:10.1007/s00213-019-05412-y  4-MeO-PCP and 3-MeO-PCMo, new dissociative drugs, produce rewarding and reinforcing effects through activation of mesolimbic dopamine pathway
  ├─ used  src/doi:10.1016/j.neuint.2021.104962  1-Phenylcyclohexan-1-amine hydrochloride (PCA HCl) alters mesolimbic dopamine system: A neuropsychopharmacological evaluation in rodents
  ├─ used  src/pmid:9152594  Metabolism of phencyclidine by human liver microsomes.
  ├─ used  src/doi:10.1007/s13181-026-01122-y  Rhabdomyolysis and Acute Kidney Injury after Use of 3-Methyl-PCP: A Case Report
  ├─ used  src/doi:10.1093/jat/bku133  Determination of designer drug cross-reactivity on five commercial immunoassay screening kits
  ├─ used  src/doi:10.3389/fpsyt.2021.669921  Pharmacotherapy of Patients Taking New Psychoactive Substances: A Systematic Review and Analysis of Case Reports
  ├─ derived_from  gen/5cfc00df-d2e3-4c34-88c1-1e8ed32203b0  Generation — pipeline-v5
  ├─ generated_by  pub/5eb8e00c-3ceb-4fe7-aa85-b0a1640bf139  Publication — backfill
    ├─ used  search/5edffae4-a924-48ab-8d7d-c98d729310b9  Searched PubChem for "3-HO-PCP"
    ├─ used  search/737c57e1-0dd9-4c12-98f5-16996189696b  Searched PubMed for "3-HO-PCP 3-hydroxyphencyclidine pharmacology"
    ├─ used  search/be069810-4e44-4473-a8c7-f51c9e20e78b  Searched PubMed for "3-hydroxyphencyclidine NMDA opioid receptor binding"
    ├─ used  search/4151a12d-f591-4944-b762-e29b8d993f56  Searched OpenAlex for "3-HO-PCP 3-hydroxyphencyclidine dissociative"
    ├─ used  search/1b425fea-4561-4a7a-a1f7-a9a06143ec55  Searched ClinicalTrials.gov for "3-HO-PCP hydroxyphencyclidine"
    ├─ used  search/eef8a130-b3ba-4458-8e6b-903f98aed28f  Searched PubMed for "3-hydroxyphencyclidine sigma receptor binding affinity"
    ├─ used  search/30920bc8-1837-440c-b636-11bd67a3f640  Searched PubMed for "3-HO-PCP new psychoactive substance NPS analytical detection mass spectrometry"
    ├─ used  search/35806915-3edd-462b-9d0c-a5145ab55aee  Searched PubMed for "phencyclidine PCP analog designer drug dissociative market emergence"
    ├─ used  search/4c8235b1-f9b4-4282-9f94-9c377d77fad7  Searched WebSearch for "3-HO-PCP binding affinity Ki mu opioid NMDA receptor pharmacology"
    ├─ used  search/74421863-470c-45b1-9b53-94e54ced8116  Searched WebSearch for "3-HO-PCP legal status scheduling US UK controlled substance"
    ├─ used  search/c6f60f07-912f-45f2-9a91-0b0392b0d3e0  Searched WebSearch for "WHO ECDD 47th 3-OH-PCP critical review scheduling recommendation 2024"
    ├─ used  search/86adb9e7-c53b-45ee-a6e0-48b5f6fbce46  Searched WebSearch for "3-HO-PCP history first synthesis research chemical market appearance year"
    ├─ used  search/086e250f-d222-4240-9842-a769f8f5fe3c  Searched HandWiki for "3-HO-PCP pharmacology history legal status"
    ├─ used  search/e232365d-42cf-494c-b8c7-f3d06aa0dc37  Searched WebSearch for "3-HO-PCP Canada Australia Germany scheduling controlled"
    ├─ used  search/3f823238-7813-44d9-beb3-79ed15b0f103  Searched PubMed for "3-MeO-PCP metabolism human hepatocytes CYP enzyme hydroxyl metabolite 3-OH-PCP"
    ├─ used  search/9e50b9e6-af62-4884-830f-9f0e7a4630b0  Searched PubMed for "phencyclidine metabolism cytochrome P450 CYP liver human hydroxylation"
    ├─ used  search/b09e6c2d-3f22-4262-982d-9e9276bf79e1  Searched PubMed for "PCP analog forensic urine immunoassay cross-reactivity detection"
    ├─ used  search/82e8a4d8-8822-4a5b-a91b-73641a1f3478  Searched PubMed for "dissociative drug psychosis NMDA antagonist schizophrenia model"
    ├─ used  search/0e1f6bd2-669f-4512-81c1-3d09f2f946c8  Searched Multiple for "3-HO-PCP binding affinities verification across sources"
    └─ used  search/4798bdbc-da27-4d23-9b08-05f5d36a821a  Searched ClinicalTrials.gov for "3-HO-PCP hydroxyphencyclidine"
├─ used  version/1  Revision 1
├─ used  claim/7f2e5cf5-ca44-4195-84f6-55b1a0a01b8d  Claim in safety — supported
  ├─ derived_from  issue/notice@713b0df5543d  Issued notice
  ├─ derived_from  issue/info_card@3f07b6c646f2  Issued info_card
  ├─ derived_from  issue/emergency@ba304cf8bf8d  Issued emergency
  ├─ derived_from  issue/info_card@452a9bae7240  Issued info_card
  ├─ informed_by  section/safety.full@1
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    ├─ used  claim/076eab43-31ac-487d-b15e-71e158844b5a  Claim in history — not_supported  working
    ├─ used  claim/5802c39d-3b60-4606-8512-8dfb347bae4a  Claim in history — supported
    ├─ used  claim/37530c1b-61f4-4851-bd82-602bdf0aeaaa  Claim in summary — inconclusive  working
    ├─ used  claim/47fea660-37eb-4901-b4a9-61dc28b1af42  Claim in pharmacology — inconclusive  working
    ├─ used  claim/e57823d8-cda1-43dc-9439-22213256aeae  Claim in pharmacology — inconclusive  working
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    ├─ used  claim/92a2f44b-b6b6-4f12-a7d1-5f0041f66386  Claim in neuroscience — inconclusive  working
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    ├─ used  claim/4ce4f1ac-d103-4ae6-8de1-36214d81ed0b  Claim in pharmacology — inconclusive  working
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    ├─ used  claim/973a58c6-3a02-4cac-b6f7-ec2e0ed64f6f  Claim in safety — inconclusive  working
    ├─ used  claim/23a0f7f5-dd66-49f3-84b9-27b5c82b364e  Claim in comparative-pharmacology — partially_supported
    ├─ used  claim/c7ff5c3a-e9ee-41d7-896d-190f592b043c  Claim in neuroscience — inconclusive  working
    ├─ used  claim/60b8fd1d-2dc4-4e26-91fc-478c93929b0a  Claim in summary — supported
    ├─ used  claim/c87b7bf5-365d-4fd8-8bc2-f3b2bfcdc691  Claim in neuroscience — supported
    ├─ used  claim/1f08745b-40b4-431b-b944-10ec2e2c672f  Claim in safety — supported
    ├─ used  claim/31526dee-7740-4209-87c3-92bd8bbd392e  Claim in safety — supported
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    ├─ used  claim/f77106ac-f92a-438d-8e1c-bb5df7087da4  Claim in receptor-pharmacology — supported
    ├─ used  claim/d6b5698c-998e-4d90-a084-9f1d011f939b  Claim in receptor-pharmacology — supported
    ├─ used  claim/68ad7912-b0cd-4c37-a360-c0ae9731ff16  Claim in receptor-pharmacology — supported
    ├─ used  claim/3e382d67-f782-43bc-b786-d7513bdd6ecb  Claim in receptor-pharmacology — supported
    ├─ used  claim/cbc17081-9876-41b6-aa6e-f7f084173f57  Claim in history — supported
    ├─ used  claim/ea11c67d-5e6f-4605-9303-ac85c51f0af0  Claim in receptor-pharmacology — supported
    ├─ used  claim/b4bfa32b-5b10-441c-bf22-718fce07e0ac  Claim in receptor-pharmacology — partially_supported
    ├─ used  claim/e0a70840-f989-40d1-953d-e9600c6e8b4c  Claim in neuroscience — partially_supported
    ├─ used  claim/c4965873-3c97-4867-bb80-ba317ce3b4c3  Claim in pharmacology — supported
    ├─ used  claim/1648ed57-e6ff-4436-801f-39d4bd460195  Claim in pharmacology — supported
    ├─ used  claim/267f0cae-f35d-411b-b767-4ea32a97b810  Claim in pharmacology — supported
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    ├─ used  claim/9d243514-39f4-4471-bd2e-c63251eb54fa  Claim in clinical-evidence — supported
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    ├─ used  claim/3a285f61-ed0d-4c11-9041-bc2b6144b7a2  Claim in safety — supported
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    ├─ used  claim/f471076f-46d3-4ccb-a571-51c3212ed077  Claim in chemistry — supported
    ├─ used  claim/1ffbf70c-2871-408d-b33a-44137aba16a6  Claim in pharmacokinetic-detail — supported
    ├─ used  claim/9ab34dda-25a9-4886-bcbe-d93b68cec9e7  Claim in pharmacokinetic-detail — supported
    ├─ used  claim/0bf116ce-7010-4d03-b458-7fc5b93ac903  Claim in pharmacokinetic-detail — supported
    ├─ used  claim/43f4f235-af26-4bd4-a791-17cec397a1c7  Claim in pharmacokinetic-detail — inconclusive  working
    ├─ used  claim/f81fe5e0-e897-4d96-b27d-173d499a07b6  Claim in pharmacokinetic-detail — supported
    ├─ used  claim/156fa0f1-aedd-41a0-9f8a-9497c787a49b  Claim in clinical-evidence — supported
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    ├─ used  claim/b4dcc316-9ad7-41ce-bb78-e31af1bb44d7  Claim in safety — supported
    ├─ used  claim/33da7420-c609-43d8-be06-a84199c5d8a2  Claim in pharmacology — supported
    ├─ used  claim/7ff78c84-f85b-43fc-a28a-1bf45ece7831  Claim in pharmacology — supported
    ├─ used  claim/920b5b19-9d5e-417e-9c44-79eb601920d7  Claim in safety — supported
    ├─ used  claim/194e275a-2967-4362-a6f0-dd2e24e53eff  Claim in chemistry — supported
    ├─ used  claim/2fa75ec7-d381-4984-9309-a6afa16fd076  Claim in pharmacokinetic-detail — supported
    ├─ used  claim/fc107750-2db3-4acf-917b-81fc8503e571  Claim in comparative-pharmacology — supported
    ├─ used  claim/87410268-a98e-4d01-9a5c-b1651e842bbc  Claim in pharmacology — inconclusive  working
    ├─ used  claim/768d5f5d-0629-42de-8bf4-a17e6b0d5f64  Claim in neuroscience — supported
    ├─ used  claim/e2e28ba0-c02f-41a5-aa11-293a10daeb36  Claim in safety — supported
    ├─ used  claim/b6c44ae9-f704-4287-b904-a6f9b2936795  Claim in safety — supported
    ├─ used  claim/82c8c5ce-e408-466a-928e-ff2c1acfdd8e  Claim in neuroscience — supported
    ├─ used  claim/b3cce8ae-5fec-4388-a428-ebeb78cc1b6f  Claim in pharmacology — supported
    ├─ used  claim/c79bcc0b-45d8-42e1-89db-42e925187454  Claim in safety — supported
    ├─ used  claim/dacc09f3-757e-40af-b03b-4deef3119631  Claim in neuroscience — supported
    ├─ used  claim/d91a1e24-7c97-476b-94c5-ebf46d337143  Claim in pharmacology — supported
    ├─ used  claim/d859b699-79cb-4713-b0ad-a9edd708030e  Claim in safety — supported
    ├─ used  claim/0eeb9ecb-f77e-4cc6-921d-d74a574e9965  Claim in pharmacology — supported
    ├─ used  claim/91c808d9-5ecf-4dc0-b7dd-4648e4ac4947  Claim in safety — supported
    ├─ used  claim/16921fe3-b7d9-440c-b362-d292aa9f39aa  Claim in pharmacokinetic-detail — supported
    ├─ used  claim/e65370e0-0c7b-44f6-8998-073d9b67d00f  Claim in safety — supported
    ├─ used  claim/9525cb2f-c08a-4a2e-9b30-4de2ca8424d6  Claim in safety — supported
    ├─ used  claim/0c5deda7-29aa-4e5f-87ac-1a454ea1d072  Claim in safety — supported
      ├─ informed_by  section/summary.full@1
      ├─ informed_by  section/history.full@1
      ├─ informed_by  section/receptor-pharmacology.full@1
      ├─ informed_by  section/pharmacology.full@1
      ├─ informed_by  section/comparative-pharmacology.full@1
      ├─ informed_by  section/neuroscience.full@1
      ├─ informed_by  section/clinical-evidence.full@1
      ├─ informed_by  section/chemistry.full@1
      └─ informed_by  section/pharmacokinetic-detail.full@1

indented by distance from this node, not by parentage

1Provenance card

the boundary, as counts

Sources

2212 with DOI

1 strong · 15 moderate · 6 weak

Compilations

12026-04-26T23:44:08.933Z

pipeline-v5 · prompt hash not recorded — run predates 2026-09

Decisions

33last ruled 2026-06-04

0 awaiting a ruling

Issued documents

42026-10-19T20:29:40.221Z

notice · info card · emergency

Searches

203 with no results

queries and counts on the build

Claims checked

7059 supported

59 supported · 11 not

Correspondence

0received

consent field ships in Phase 4

Edges

228

derivations recorded for this entity

Complete over 22 sources, 1 compilation, and 33 decisions.Not here: the private journal (never).Working material — drafts, discards, unsupported claims — is listed below and readable on the working page.Cite: psychedex.org/substances/3-ho-pcp/archive

2Build

one panel per compilation run

generation run 2026-04-26

74 min completedmodel pipeline-v5plan not recordedrun/143aea9b…

Selection

results seen80
selected by the model25
consumed as sources22

Verification

claims checked70
supported50
partially supported9
not supported1
inconclusive10
  • record
  • seen / partial
  • working

The model's own caveats

  • sparse_evidence
  • safety_data_gap

Reproduce

inputs
22 source keys (listed under Sources)
plan
not recorded — template version, prompt hash and git SHA are written from 2026-09 onward
model
pipeline-v5
streams
none — agent transcripts are persisted from 2026-09 onward
20 searches — query, source, results, what was kept and why
20 searches for this run
#sourcequeryseenkeptrationale
1ClinicalTrials.gov · absence3-HO-PCP hydroxyphencyclidine00No trials registered
2PubMed3-HO-PCP new psychoactive substance NPS analytical detection mass spectrometry11Critical pharmacokinetic data: plasma protein binding, metabolism, in vivo concentrations
3PubMedphencyclidine PCP analog designer drug dissociative market emergence31Wallach & Brandt provides historical context for PCP analog NPS market; 3-MeO-PCP papers provide class context for 3-HO-PCP
4OpenAlex3-HO-PCP 3-hydroxyphencyclidine dissociative52Both are relevant review papers covering dissociative NPS class
5PubChem3-HO-PCP11Primary chemical identity verification
6PubMed3-HO-PCP 3-hydroxyphencyclidine pharmacology11Primary case report of 3-HO-PCP toxicity; direct relevance
7PubMed3-hydroxyphencyclidine NMDA opioid receptor binding11Foundational receptor binding localization study for 3-HO-PCP
8PubMed3-hydroxyphencyclidine sigma receptor binding affinity22Early pharmacological characterization of 3-HO-PCP binding sites in rat brain
9HandWiki3-HO-PCP pharmacology history legal status13Secondary source with referenced primary data; binding values consistent across multiple sources
10WebSearch3-HO-PCP binding affinity Ki mu opioid NMDA receptor pharmacology101Critical pharmacological data not available in PubMed searches; verified across multiple web sources
11WebSearch3-HO-PCP legal status scheduling US UK controlled substance101Legal status not available in PubMed; web sources provide jurisdiction-specific information
12WebSearch3-HO-PCP history first synthesis research chemical market appearance year101History of synthesis and market emergence not in PubMed; web aggregation of primary sources
13WebSearchWHO ECDD 47th 3-OH-PCP critical review scheduling recommendation 2024102Regulatory milestone: WHO reviewing for international scheduling in 2024
14WebSearch3-HO-PCP Canada Australia Germany scheduling controlled103Comprehensive multi-jurisdiction legal status
15Multiple3-HO-PCP binding affinities verification across sources51Values consistent across multiple sources; marked as web_retrieved due to inability to verify original primary paper directly
16PubMed · absence3-MeO-PCP metabolism human hepatocytes CYP enzyme hydroxyl metabolite 3-OH-PCP00Query too specific; pivoted to broader metabolism search
17ClinicalTrials.gov · absence3-HO-PCP hydroxyphencyclidine00Confirmed no ongoing clinical development
18PubMeddissociative drug psychosis NMDA antagonist schizophrenia model61Mechanism of psychosis risk from NMDA antagonism; relevant to 3-HO-PCP psychological hazard
19PubMedphencyclidine metabolism cytochrome P450 CYP liver human hydroxylation22Critical for understanding metabolic pathway and CYP enzyme interactions for 3-HO-PCP
20PubMedPCP analog forensic urine immunoassay cross-reactivity detection21Important for harm reduction: standard drug screens likely to miss 3-HO-PCP
70 claims by section — every cited sentence, checked against its source
safety18 · 17 ok
  • The only analytically confirmed case of severe acute toxicity involved co-ingestion of 3-HO-PCP with N-ethylhexedrone in the United Kingdomsupported

    We describe an analytically confirmed case of acute toxicity related to the use of both 3-hydroxyphencyclidine and N-ethylhexedrone. s13181-019-00734-x

  • A postmortem forensic case reported a blood concentration of 0.095 mg/kg 3-HO-PCP in a deceased individual, though multiple other substances were co-detected and causation was not established.supported

    Blood concentrations: 0.013 mg/kg (living) and 0.095 mg/kg (deceased). dta.2807

  • The combination of NMDA receptor antagonism with intrinsic μ-opioid agonism (Ki ≈ 39–60 nM) creates a compound risk for respiratory depression beyond what either pharmacological mechanism alone producespartially supported

    Dual NMDA and opioid interactions as synergistic mechanism. appi.ajp.20240378

  • Rhabdomyolysis and acute kidney injury have been documented in the PCP analog class (3-methyl-PCP), establishing rhabdomyolysis as a plausible class risksupported

    First confirmed case of 3-methyl-PCP (novel arylcyclohexylamine) with rhabdomyolysis and acute kidney injury. s13181-026-01122-y

  • Standard urine immunoassay PCP screens detect only approximately 20% of PCP structural analogs, making 3-HO-PCP likely to produce a false-negative result on standard clinical drug testingsupported

    DRI Phencyclidine enzyme assay detected 20% of PCP analogs at 100 mcg/mL. bku133

  • Confirmatory identification requires liquid chromatography–high-resolution mass spectrometry (LC-HRMS).supported

    3-HO-PCP detected in law enforcement seizure and forensic samples in Denmark... using high resolution mass spectrometry dta.2807

  • NMDA antagonists are capable of inducing positive symptoms (hallucinations, paranoia), negative symptoms (emotional withdrawal, psychomotor retardation), and formal thought disorder — a symptom cluster that models aspects of schizophrenia.supported

    PCP induces psychotomimetic state resembling schizophrenia, with both positive (hallucinations, paranoia) and negative symptoms (emotional withdrawal, motor retardation), formal thought disorder, and neuropsychological deficits. pmid:1654746

  • NMDA antagonists are capable of inducing positive symptoms (hallucinations, paranoia), negative symptoms (emotional withdrawal, psychomotor retardation), and formal thought disorder — a symptom cluster that models aspects of schizophrenia.supported

    NMDA receptor antagonists (dissociative anesthetics) can replicate full range of psychotic, negative, cognitive symptoms of schizophrenia. sbs076

  • Dissociative-type psychological dependence: Abuse potential via the mesolimbic dopamine pathway is documented for PCP analogs including 4-MeO-PCP, PCA, and 4-F-PCP.supported

    4-MeO-PCP and 3-MeO-PCMo (PCP analogs) produce rewarding/reinforcing effects via mesolimbic dopamine pathway. s00213-019-05412-y

  • Dissociative-type psychological dependence: Abuse potential via the mesolimbic dopamine pathway is documented for PCP analogs including 4-MeO-PCP, PCA, and 4-F-PCP.supported

    PCA (PCP analog) induces CPP and self-administration in rodents via dopaminergic system. j.neuint.2021.104962

  • Alcohol: Additive CNS depression documented in PCP analog intoxication cases.supported

    Two young men in comatose state (Glasgow score 3), respiratory acidosis, anisocoria, hypothermia after 3-MeO-PCP + alcohol. j.forsciint.2016.12.028

  • Co-ingestion of 3-HO-PCP with N-ethylhexedrone (a synthetic cathinone stimulant) produced severe toxicity in the only analytically confirmed UK case reportsupported

    We describe an analytically confirmed case of acute toxicity related to the use of both 3-hydroxyphencyclidine and N-ethylhexedrone. s13181-019-00734-x

  • By analogy with 3-MeO-PCP (CYP2B6/2C19/2D6) and PCP (CYP3A4):supported

    CYP2B6 responsible for aliphatic hydroxylations; CYP2C19 and CYP2D6 for O-demethylation. 1570159x14666161018151716

  • By analogy with 3-MeO-PCP (CYP2B6/2C19/2D6) and PCP (CYP3A4):supported

    CYP3A plays major role in PCP biotransformation in human liver microsomes. pmid:9152594

  • Claim in safety — inconclusiveinconclusiveworking →

  • Benzodiazepines remain first-line for agitation and psychomotor symptoms, consistent with standard NPS treatment guidelines.supported

    Pharmacotherapy primarily consisted of benzodiazepines (62.7%), neuroleptics, muscle relaxants. fpsyt.2021.669921

  • History of psychotic disorders or schizophrenia: NMDA receptor antagonism is psychotomimetic and can precipitate or exacerbate psychotic episodessupported

    PCP induces psychotomimetic state resembling schizophrenia, with both positive (hallucinations, paranoia) and negative symptoms. pmid:1654746

  • History of psychotic disorders or schizophrenia: NMDA receptor antagonism is psychotomimetic and can precipitate or exacerbate psychotic episodessupported

    NMDA receptor antagonists (dissociative anesthetics) can replicate full range of psychotic, negative, cognitive symptoms of schizophrenia. sbs076

pharmacology13 · 9 ok
  • Claim in pharmacology — inconclusiveinconclusiveworking →

  • Claim in pharmacology — inconclusiveinconclusiveworking →

  • Claim in pharmacology — inconclusiveinconclusiveworking →

  • Claim in pharmacology — inconclusiveinconclusiveworking →

  • 3-HO-PCP is a confirmed metabolite of 3-MeO-PCP, produced by aromatic O-demethylation of the 3-methoxy groupsupported

    CYP2C19 and CYP2D6 for O-demethylation. Multiple aliphatic hydroxylations, aromatic hydroxylation, O-demethylation, and glucuronidation identified. 1570159x14666161018151716

  • By analogy with structurally related PCP analogs (4-MeO-PCP, 3-MeO-PCMo, PCA, 4-F-PCP), which produce reward and reinforcement via the mesolimbic dopamine pathway, dopaminergic involvement in 3-HO-PCP's rewarding effects is probable but unconfirmed for this specific compound .supported

    4-MeO-PCP and 3-MeO-PCMo (PCP analogs) produce rewarding/reinforcing effects via mesolimbic dopamine pathway. s00213-019-05412-y

  • By analogy with structurally related PCP analogs (4-MeO-PCP, 3-MeO-PCMo, PCA, 4-F-PCP), which produce reward and reinforcement via the mesolimbic dopamine pathway, dopaminergic involvement in 3-HO-PCP's rewarding effects is probable but unconfirmed for this specific compound .supported

    PCA (PCP analog) induces CPP and self-administration in rodents via dopaminergic system; altered DA, TH, D1R, D2R expression in NAc and VTA. j.neuint.2021.104962

  • All available human data derive from a single forensic analytical study using law enforcement seizure and casework samples from Denmark.supported

    3-HO-PCP detected in law enforcement seizure and forensic samples in Denmark. dta.2807

  • The unbound plasma fraction is 0.72 ± 0.09, indicating that approximately 28% of circulating 3-HO-PCP is protein-boundsupported

    Plasma protein binding unbound fraction 0.72±0.09. dta.2807

  • This relatively high free fraction facilitates CNS distribution, consistent with a postmortem brain-to-blood ratio of approximately 1.5.supported

    Brain concentration 1.5-fold higher than postmortem blood. dta.2807

  • Four metabolites have been identified after in vitro incubation with pooled human hepatocytes: a piperidine-hydroxyl metabolite (aliphatic hydroxylation), an N-dealkyl carboxylic acid metabolite (piperidine ring-opened; the dominant urinary metabolite in deconjugated urine), an O-glucuronide conjugate, and an O-sulfate conjugate (detected in vitro but not in vivo).partially supported

    Four metabolites identified in vitro: piperidine-hydroxyl, N-dealkyl-COOH, O-glucuronidated, O-sulfate-conjugated. N-dealkylated-COOH metabolite was main metabolite in urine. dta.2807

  • By class analogy, PCP is primarily metabolized by CYP3A4, while 3-MeO-PCP undergoes aliphatic hydroxylation via CYP2B6 and O-demethylation via CYP2C19 and CYP2D6. 3-HO-PCP metabolism likely involves CYP2B6 and CYP3A4/5, but this is class inference only .supported

    CYP3A plays major role in PCP biotransformation in human liver microsomes. pmid:9152594

  • By class analogy, PCP is primarily metabolized by CYP3A4, while 3-MeO-PCP undergoes aliphatic hydroxylation via CYP2B6 and O-demethylation via CYP2C19 and CYP2D6. 3-HO-PCP metabolism likely involves CYP2B6 and CYP3A4/5, but this is class inference only .supported

    CYP2B6 responsible for aliphatic hydroxylations; CYP2C19 and CYP2D6 for O-demethylation. 1570159x14666161018151716

neuroscience7 · 5 ok
  • Glutamate hypothesis of psychosis: NMDA receptor hypofunction — whether induced pharmacologically by PCP-type compounds or occurring endogenously — produces positive symptoms (hallucinations, paranoia), negative symptoms (withdrawal, flattened affect), and cognitive disorganization that model aspects of schizophrenia. 3-HO-PCP's high NMDA affinity (Ki ≈ 30 nM) and additional opioid activity may produce a psychotomimetic profile qualitatively distinct from ketamine or PCP, though this has not been systematically studied.supported

    PCP induces psychotomimetic state resembling schizophrenia, with both positive (hallucinations, paranoia) and negative symptoms (emotional withdrawal, motor retardation), formal thought disorder, and neuropsychological deficits. pmid:1654746

  • Glutamate hypothesis of psychosis: NMDA receptor hypofunction — whether induced pharmacologically by PCP-type compounds or occurring endogenously — produces positive symptoms (hallucinations, paranoia), negative symptoms (withdrawal, flattened affect), and cognitive disorganization that model aspects of schizophrenia. 3-HO-PCP's high NMDA affinity (Ki ≈ 30 nM) and additional opioid activity may produce a psychotomimetic profile qualitatively distinct from ketamine or PCP, though this has not been systematically studied.supported

    NMDA receptor antagonists (dissociative anesthetics) can replicate full range of psychotic, negative, cognitive symptoms of schizophrenia. NMDA receptor hypofunction hypothesis. sbs076

  • NMDA receptor blockade reduces excitatory glutamatergic transmission, particularly at GABAergic interneurons in cortical microcircuits, producing a net disinhibition of pyramidal neurons and disrupting the normal pattern of cortico-thalamo-cortical information flow.supported

    Parvalbumin-positive cortical GABAergic neuron downregulation, pyramidal dendritic dysgenesis. sbs076

  • Claim in neuroscience — inconclusiveinconclusiveworking →

  • Autoradiographic mapping of [³H]3-OH-PCP binding sites in rat brain reveals highest density in the hippocampal formation (CA1 stratum radiatum and oriens, dentate gyrus), with high binding in superficial cortical layers, amygdala, and thalamuspartially supported

    High densities in CA1 hippocampus, outer layers of cortex. pmid:8884223

  • Claim in neuroscience — inconclusiveinconclusiveworking →

  • Incentive salience (wanting vs liking): Dopaminergic reward pathway involvement, documented for PCP analogs, suggests 3-HO-PCP may produce both liking (hedonic, mediated by opioid activity) and wanting (motivational, mediated by mesolimbic dopamine), potentially conferring higher abuse liability than compounds that engage only one system.supported

    4-MeO-PCP and 3-MeO-PCMo (PCP analogs) produce rewarding/reinforcing effects via mesolimbic dopamine pathway. Alteration of accumbal CREB, deltaFosB, and BDNF levels. s00213-019-05412-y

pharmacokinetic-detail7 · 6 ok
  • All quantitative human pharmacokinetic data for 3-HO-PCP derive from a single forensic analytical study using law enforcement seizures and casework samples from Denmark — not controlled clinical trialssupported

    3-HO-PCP detected in law enforcement seizure and forensic samples in Denmark. dta.2807

  • The unbound fraction (fu) was determined as 0.72 ± 0.09, indicating moderate plasma binding (~28% bound)supported

    Plasma protein binding unbound fraction 0.72±0.09. dta.2807

  • Four metabolites were identified after incubation with pooled human hepatocytes:supported

    Four metabolites identified in vitro: piperidine-hydroxyl, N-dealkyl-COOH, O-glucuronidated, O-sulfate-conjugated. dta.2807

  • Claim in pharmacokinetic-detail — inconclusiveinconclusiveworking →

  • PCP: primarily CYP3A4supported

    CYP3A plays major role in PCP biotransformation in human liver microsomes. pmid:9152594

  • 3-MeO-PCP: CYP2B6 for aliphatic hydroxylations; CYP2C19 and CYP2D6 for O-demethylation (producing 3-HO-PCP as a metabolite)supported

    CYP2B6 responsible for aliphatic hydroxylations; CYP2C19 and CYP2D6 for O-demethylation. 1570159x14666161018151716

  • Postmortem brain-to-blood concentration ratio was approximately 1.5, indicating moderate-to-good CNS penetration consistent with the compound's lipophilicity and high unbound fraction.supported

    Brain concentration 1.5-fold higher than postmortem blood. dta.2807

receptor-pharmacology7 · 7 ok
  • The trend is consistent with autoradiographic and radioligand displacement studies that used [³H]3-OH-PCP to map NMDA/PCP receptor distributionsupported

    Quantitative autoradiography of [3H]3-OH-PCP binding in rat brain. pmid:8884223

  • The trend is consistent with autoradiographic and radioligand displacement studies that used [³H]3-OH-PCP to map NMDA/PCP receptor distributionsupported

    Binding of a novel radioligand, [3H]3-OH-PCP, to NMDA receptor-coupled and -uncoupled PCP sites was investigated in rat brain. pmid:7620917

  • Autoradiographic studies using [³H]3-OH-PCP in rat brain established a binding distribution closely corresponding to [³H]TCP and [³H]MK-801 binding sites:supported

    Distribution consistent with [3H]TCP and [3H]MK-801 binding sites. pmid:7620917

  • Autoradiographic studies using [³H]3-OH-PCP in rat brain established a binding distribution closely corresponding to [³H]TCP and [³H]MK-801 binding sites:supported

    Regional distribution corresponds to [3H]TCP and [3H]MK-801 binding sites. pmid:8884223

  • The binding pattern confirmed that 3-OH-PCP binds to NMDA/PCP ion-channel complexes in preference to sigma sitessupported

    suggesting 3-OH-PCP binds to NMDA/PCP ion-channel complexes in preference to sigma sites. pmid:7620917

  • MK-801 strongly inhibited [³H]3-OH-PCP binding, and glutamate/glycine/polyamine site antagonists displaced it similarly to [³H]MK-801.partially supported

    Strongly inhibited by MK-801. Binding site similar/identical to PCP site labeled by [3H]TCP and [3H]MK-801. pmid:8884223

  • In early receptor characterization work using rat brain membrane preparations, [³H]PCP-3-OH labeled both a high-affinity component shared with (+)[³H]SKF 10047 (a sigma ligand) and a lower-affinity, PCP-selective component unaffected by guanine nucleotidessupported

    [3H]PCP-3-OH used as prototypical ligand for labeling sigma- and PCP-receptor subtypes. Low affinity [3H]PCP-3-OH binding representing PCP-selective site unaffected by GTP. pmid:2834673

history6 · 5 ok
  • Claim in history — not_supportednot supportedworking →

  • By 1988, Itzhak and colleagues had adopted tritium-labeled 3-HO-PCP ([³H]3-OH-PCP, also designated [³H]PCP-3-OH) as a radioligand to characterize sigma and PCP receptor binding sites in rat brain membranessupported

    [3H]PCP-3-OH used as prototypical ligand for labeling sigma- and PCP-receptor subtypes. pmid:2834673

  • By 1988, Itzhak and colleagues had adopted tritium-labeled 3-HO-PCP ([³H]3-OH-PCP, also designated [³H]PCP-3-OH) as a radioligand to characterize sigma and PCP receptor binding sites in rat brain membranessupported

    3-HO-PCP ([3H]PCP-3-OH) used as radioligand to label sigma and PCP binding sites in rat brain membranes. pmid:2893238

  • Through the 1990s, autoradiographic studies using [³H]3-OH-PCP mapped the brain distribution of NMDA/PCP ion-channel complexes, confirming binding preference for NMDA sites over sigma sites.supported

    Distribution consistent with [3H]TCP and [3H]MK-801 binding sites, suggesting 3-OH-PCP binds to NMDA/PCP ion-channel complexes in preference to sigma sites. pmid:7620917

  • Through the 1990s, autoradiographic studies using [³H]3-OH-PCP mapped the brain distribution of NMDA/PCP ion-channel complexes, confirming binding preference for NMDA sites over sigma sites.supported

    Regional distribution corresponds to [3H]TCP and [3H]MK-801 binding sites. Binding site similar/identical to PCP site labeled by [3H]TCP and [3H]MK-801. pmid:8884223

  • Law enforcement seizures followed — analytically confirmed detections were reported in Denmark and the United Kingdom.partially supported

    3-HO-PCP detected in law enforcement seizure and forensic samples in Denmark. dta.2807

summary5 · 4 ok
  • First synthesized in 1978 as part of PCP structure-activity relationship studies, 3-HO-PCP served primarily as a pharmacological radioligand for NMDA/PCP receptor characterization throughout the 1980s and 1990spartially supported

    [3H]PCP-3-OH used as prototypical ligand for labeling sigma- and PCP-receptor subtypes. pmid:2834673

  • First synthesized in 1978 as part of PCP structure-activity relationship studies, 3-HO-PCP served primarily as a pharmacological radioligand for NMDA/PCP receptor characterization throughout the 1980s and 1990spartially supported

    3-HO-PCP ([3H]PCP-3-OH) used as radioligand to label sigma and PCP binding sites in rat brain membranes. pmid:2893238

  • Claim in summary — inconclusiveinconclusiveworking →

  • The dual NMDA/opioid profile creates compound respiratory depression risk beyond what either mechanism produces alone — a substance-specific hazard not shared by most dissociativespartially supported

    Dual NMDA and opioid interactions as synergistic mechanism. appi.ajp.20240378

  • All documented serious adverse events involved polydrug exposure. μ-Opioid agonism predicts physical dependence liability with repeated use, while NMDA antagonism carries psychotomimetic risk including hallucinations, paranoia, and formal thought disordersupported

    PCP induces psychotomimetic state resembling schizophrenia, with both positive (hallucinations, paranoia) and negative symptoms (emotional withdrawal, motor retardation), formal thought disorder, and neuropsychological deficits. pmid:1654746

comparative-pharmacology3 · 2 ok
  • Claim in comparative-pharmacology — inconclusiveinconclusiveworking →

  • 3-MeO-PCP (3-methoxyphencyclidine) is the O-methylated structural analog and metabolic precursor of 3-HO-PCP — aromatic O-demethylation of 3-MeO-PCP produces 3-HO-PCP as a human metabolitesupported

    CYP2C19 and CYP2D6 for O-demethylation. Multiple aliphatic hydroxylations, aromatic hydroxylation, O-demethylation, and glucuronidation identified. 1570159x14666161018151716

  • Both ketamine and 3-HO-PCP act as uncompetitive NMDA receptor channel blockers, but they differ substantially in potency (3-HO-PCP Ki ≈ 30 nM vs ketamine Ki ≈ 800–2,500 nM at the MK-801 site), opioid activity (3-HO-PCP has intrinsic MOR agonism; ketamine's opioid interactions are indirect and debated), and duration (3-HO-PCP 4–6 hours oral vs ketamine 1–2 hours)partially supported

    Argues ketamine pharmacology should be redefined to include opioid receptors. Dual NMDA and opioid interactions as synergistic mechanism. appi.ajp.20240378

chemistry2 · 2 ok
  • This 3-hydroxyl substitution is pharmacologically consequential: it confers substantial μ-opioid receptor affinity absent in the parent compound, and it is the product of aromatic O-demethylation of 3-MeO-PCP. 3-HO-PCP is thus both a standalone research chemical and a confirmed human metabolite of 3-MeO-PCP.supported

    CYP2C19 and CYP2D6 for O-demethylation. Multiple aliphatic hydroxylations, aromatic hydroxylation, O-demethylation, and glucuronidation identified. 1570159x14666161018151716

  • The phenolic hydroxyl group renders 3-HO-PCP susceptible to phase II conjugation reactions (glucuronidation, sulfation) that the methoxy analog 3-MeO-PCP does not undergo directly.supported

    Four metabolites identified in vitro: piperidine-hydroxyl, N-dealkyl-COOH, O-glucuronidated, O-sulfate-conjugated. dta.2807

clinical-evidence2 · 2 ok
  • Dunlop et al. (2020) reported an analytically confirmed case of severe toxicity following co-ingestion of 3-HO-PCP and N-ethylhexedrone (a synthetic cathinone stimulant) in the United Kingdomsupported

    We describe an analytically confirmed case of acute toxicity related to the use of both 3-hydroxyphencyclidine and N-ethylhexedrone. s13181-019-00734-x

  • Davidsen et al. (2020) reported forensic casework including one deceased individual with a blood concentration of 0.095 mg/kg 3-HO-PCPsupported

    Blood concentrations: 0.013 mg/kg (living) and 0.095 mg/kg (deceased). dta.2807

3Sources

22 consumed · sorted by year · feeds = sections resting on it

Sources
yearsourcetierstatusfeeds
2026Rhabdomyolysis and Acute Kidney Injury after Use of 3-Methyl-PCP: A Case ReportDeutsch AB, Ebeling-Koning NE, Krotulski AJ, Walton SE, Katz KD · Journal of Medical Toxicologydoi:10.1007/s13181-026-01122-yweakconsumed1 section
2025Redefining Ketamine Pharmacology for Antidepressant Action: Synergistic NMDA and Opioid Receptor InteractionsLevinstein MR, Budinich RC, Bonaventura J, Schatzberg AF, Zarate CA, Michaelides M · American Journal of Psychiatrydoi:10.1176/appi.ajp.20240378moderateconsumed5 sections
20243-OH-PCP 47th ECDD Critical Review (Public Version)WHO Expert Committee on Drug Dependenceurl:4815d0a19d492379weakconsumedcited only
2024International Drug Scheduling; Convention on Psychotropic Substances; 3-Hydroxy-phencyclidine; Request for CommentsUS Federal Register / DEAurl:4a24ec5055100265weakconsumedcited only
2024PubChem Compound Summary: 3-(1-Piperidin-1-ylcyclohexyl)phenol (CID 133277)National Center for Biotechnology Information (NCBI)url:d9e63c4e7d08f8bfmoderateconsumedcited only
20233-HO-PCP - HandWikiHandWiki contributorsurl:7446623ee08acd4eweakconsumedcited only
20211-Phenylcyclohexan-1-amine hydrochloride (PCA HCl) alters mesolimbic dopamine system: A neuropsychopharmacological evaluation in rodentsAbiero A, Perez Custodio RJ, Botanas CJ, Ortiz DM, Sayson LV, Kim M, Lee HJ, Yoon S, Lee YS, Cheong JH, Kim HJ · Neurochemistry Internationaldoi:10.1016/j.neuint.2021.104962moderateconsumed2 sections
2021Pharmacotherapy of Patients Taking New Psychoactive Substances: A Systematic Review and Analysis of Case ReportsOrdak M, Zmysłowska A, Bielski M, Rybak D, Tomaszewska M · Frontiers in Psychiatrydoi:10.3389/fpsyt.2021.669921moderateconsumed1 section
20204-MeO-PCP and 3-MeO-PCMo, new dissociative drugs, produce rewarding and reinforcing effects through activation of mesolimbic dopamine pathwayAbiero A, Botanas CJ, Custodio RJ, Sayson LV, Kim M, Lee HJ, Kim HJ, Lee KW, Jeong Y, Seo JW, Ryu IS, Lee YS, Cheong JH · Psychopharmacologydoi:10.1007/s00213-019-05412-ymoderateconsumed3 sections
2020Designer drugs: mechanism of action and adverse effectsLuethi D, Liechti ME · Archives of Toxicologydoi:10.1007/s00204-020-02693-7strongconsumed4 sections
2020In vitro and in vivo metabolism and detection of 3-HO-PCP, a synthetic phencyclidine, in human samples and pooled human hepatocytes using high resolution mass spectrometryDavidsen AB, Mardal M, Johansen SS, Dalsgaard PW, Linnet K · Drug Testing and Analysisdoi:10.1002/dta.2807moderateconsumed6 sections
2020Severe Toxicity to the New Psychoactive Substances 3-Hydroxyphencyclidine and N-Ethylhexedrone: an Analytically Confirmed Case ReportDunlop LC, Wood D, Archer J, Hudson S, Dargan P · Journal of Medical Toxicologydoi:10.1007/s13181-019-00734-xweakconsumed2 sections
20173-MeO-PCP intoxication in two young men: First in vivo detection in ItalyBertol E, Pascali J, Palumbo D, Catalani V, Di Milia MG, Fioravanti A, Mari F, Vaiano F · Forensic Science Internationaldoi:10.1016/j.forsciint.2016.12.028weakconsumed1 section
2017New Psychoactive Substances 3-Methoxyphencyclidine (3-MeO-PCP) and 3-Methoxyrolicyclidine (3-MeO-PCPy): Metabolic Fate Elucidated with Rat Urine and Human Liver PreparationsMichely JA, Manier SK, Caspar AT, Brandt SD, Wallach J, Maurer HH · Current Neuropharmacologydoi:10.2174/1570159x14666161018151716moderateconsumedcited only
2015Determination of designer drug cross-reactivity on five commercial immunoassay screening kitsRegester LE, Chmiel JD, Holler JM, Vorce SP, Levine B, Bosy TZ · Journal of Analytical Toxicologydoi:10.1093/jat/bku133moderateconsumed1 section
2012NMDA receptor and schizophrenia: a brief historyCoyle JT · Schizophrenia Bulletindoi:10.1093/schbul/sbs076moderateconsumed3 sections
1997Metabolism of phencyclidine by human liver microsomes.Laurenzana EM, Owens SM · Drug Metabolism and Dispositionpmid:9152594moderateconsumed3 sections
1996Autoradiographic study on the pharmacological characteristics of [3H]3-OH-PCP binding sites in rat brainSuzuki T, Yamamoto T, Hori T, Baba A, Shiraishi H, Ito T, Piletz JE, Ho IK · European Journal of Pharmacologypmid:8884223moderateconsumed3 sections
1995Quantitative autoradiographic localization of [3H]3-OH-PCP (1-(1(3-hydroxyphenyl)cyclohexyl)piperidine) binding sites in rat brainSuzuki T, Yamamoto T, Hori T, Abe S, Moroji T, Shiraishi H, Ito T, Ho IK · Brain Research Bulletinpmid:7620917moderateconsumed2 sections
1991Recent advances in the phencyclidine model of schizophreniaJavitt DC, Zukin SR · American Journal of Psychiatrypmid:1654746moderateconsumed3 sections
1988Pharmacological specificity of some psychotomimetic and antipsychotic agents for the sigma and PCP binding sitesItzhak Y · Life Sciencespmid:2893238moderateconsumed2 sections
1988Regulation of the binding of sigma- and phencyclidine (PCP)-receptor ligands in rat brain membranes by guanine nucleotides and ionsItzhak Y, Khouri M · Neuroscience Letterspmid:2834673moderateconsumed3 sections
—Searched ClinicalTrials.gov for "3-HO-PCP hydroxyphencyclidine" — no resultsabsenceno results—
—Searched ClinicalTrials.gov for "3-HO-PCP hydroxyphencyclidine" — no resultsabsenceno results—
—Searched PubMed for "3-MeO-PCP metabolism human hepatocytes CYP enzyme hydroxyl metabolite 3-OH-PCP" — no resultsabsenceno results—

4Docket

one filing per activity — decisions, correspondence, reports

  1. 0012026-04-27revisionRevision 1

    Initial LLM generation (v5 pipeline, wiki)

    psx:substance/3-ho-pcp/version/1
  2. 0022026-06-04proposal31 value proposals approved together

    one review action inferred from a shared reviewer and instant — the graph records one activity per proposal

    31 items in this filing

    • dose_tier · light
    • dose_tier · common
    • dose_tier · strong
    • dose_tier · heavy
    • timeline · oral · onset
    • timeline · oral · come_up
    • timeline · oral · peak
    • timeline · oral · plateau
    • timeline · oral · resolution
    • timeline · oral · afterglow
    • toxicity
    • dependence · full
    • withdrawal
    • tolerance
    • dosage · oral
    • duration · oral · onset
    • duration · oral · come_up
    • duration · oral · peak
    • duration · oral · offset
    • duration · oral · total
    • duration · oral · aftereffects
    • contraindication · psychiatric
    • contraindication · psychiatric
    • contraindication · respiratory
    • contraindication · hepatic
    • contraindication · other
    • contraindication · other
    • contraindication · other
    • contraindication · cardiovascular
    • contraindication · pregnancy_breastfeeding
    psx:substance/3-ho-pcp/proposal/dose_tier/83aa77dd-a50e-4a46-89d1-09e469007554
  3. 0032026-06-04publicationPublication — backfill

5Issued documents

what the notice, info card and emergency page said, by hash

Issued documents
documentcontent hashissuedfrom versionsuperseded
info_card452a9bae7240c474b18cbcb2…2026-10-19 20:29Revision 1current
emergencyba304cf8bf8de5b4ec66cb2b…2026-09-04 04:27Revision 1current
info_card3f07b6c646f2233b16cbf2b0…2026-09-04 04:27Revision 1superseded2026-10-19
notice713b0df5543d4f37a311442b…2026-09-04 04:27Revision 1current