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Creation Date 2005-06-13 13:24:05
Update Date 2009-06-23 18:08:16
Primary Accession Number DB00652
Secondary Accession Number
  • APRD01173
Name Pentazocine
Drug Type
  • Approved
  • Small Molecule
Description The first mixed agonist-antagonist analgesic to be marketed. It is an agonist at the kappa and sigma opioid receptors and has a weak antagonist action at the mu receptor. (From AMA Drug Evaluations Annual, 1991, p97)
Synonyms
  1. L-pentazocine
  2. Pentazocaine
  3. Pentazocin
Brand Names
  1. Fortalgesic
  2. Fortalin
  3. Fortral
  4. Liticon
  5. Pentagin
  6. Soseton
  7. Sosigon
  8. Talwan
Brand Mixtures
  1. Talacen (pentazocine + acetaminophen)
  2. Talwin (pentazocine + naloxone)
Chemical IUPAC Name (1S,9S,13S)-1,13-dimethyl-10-(3-methylbut-2-en-1-yl)-10-azatricyclo[7.3.1.02,7]trideca-2,4,6-trien-4-ol
Chemical Formula C19H27NO
Chemical Structure Structure
CAS Registry Number 359-83-1
InChI Identifier InChI=1/C19H27NO/c1-13(2)7-9-20-10-8-19(4)14(3)18(20)11-15-5-6-16(21)12-17(15)19/h5-7,12,14,18,21H,8-11H2,1-4H3/t14-,18+,19+/m0/s1
InChI Key VOKSWYLNZZRQPF-GDIGMMSIBX
KEGG Drug D00498 Link Image
KEGG Compound C07421 Link Image
PubChem Compound 441278 Link Image
PubChem Substance 9625 Link Image
ChEBI ID Not Available
PharmGKB ID PA450852 Link Image
HET ID Not Available
GenBank ID Not Available
Drug ID Number [DIN] 02241976 Link Image
RxList Link http://www.rxlist.com/cgi/generic/pentazocine.htm Link Image
PDRhealth Link Not Available
Wikipedia Link http://en.wikipedia.org/wiki/Pentazocine Link Image
FDA Label Not Available
Material Safety Data Sheet (MSDS)
Synthesis Reference Not Available
Average Molecular Weight 285.4238
Monoisotopic Molecular Weight 285.2093
State Solid
Melting Point 146.3 oC
Experimental Water Solubility Not Available Source: PhysProp
Predicted Water Solubility 1.22e-01 mg/mL Calculated using ALOGPS
Experimental LogP/Hydrophobicity 3.7 Source: PhysProp
Predicted LogP 4.44 Calculated using ALOGPS
Experimental LogS Not Available
Predicted LogS -3.37 Calculated using ALOGPS
Experimental Caco2 Permeability Not Available
pKa/Isoelectric Point 8.88
Mass Spectrum Not Available
MOL File Show Link Image | Download Link Image
SDF File Show Link Image | Download Link Image
PDB File Show Link Image | Download Link Image
2D Structure
3D Structure
Experimental PDB ID Not Available
Isomeric SMILES C[C@H]1[C@H]2CC3=C(C=C(O)C=C3)[C@]1(C)CCN2C\C=C(\C)C
Canonical SMILES CC1C2CC3=C(C=C(O)C=C3)C1(C)CCN2CC=C(C)C
Drug Category
  • Adjuvants, Anesthesia
  • Analgesics, Opioid
  • Narcotic Antagonists
  • Narcotics
ATC Codes
AHFS Codes
  • 28:08.12
Indication For the relief of moderate to severe pain.
Pharmacology Pentazocine is a potent analgesic which when administered orally in a 50 mg dose appears equivalent in analgesic effect to 60 mg (1 grain) of codeine. Onset of significant analgesia usually occurs between 15 and 30 minutes after oral administration, and duration of action is usually three hours or longer. Onset and duration of action and the degree of pain relief are related both to dose and the severity of pretreatment pain. Pentazocine weakly antagonizes the analgesic effects of morphine and meperidine; in addition, it produces incomplete reversal of cardiovascular, respiratory, and behavioral depression induced by morphine and meperidine. Pentazocine has about 1/50 the antagonistic activity of nalorphine. It also has sedative activity.
Mechanism of Action The preponderance of evidence suggests that pentazocine antagonizes the opioid effects by competing for the same receptor sites, especially the opioid mu receptor.
Absorption Well absorbed from the gastro-intestinal tract.
Toxicity Not Available
Protein Binding Not Available
Biotransformation Hepatic
Half Life 2 to 3 hours
Dosage Forms
Form Route
Solution Intravenous
Tablet Oral
Patient Information Show Link Image
Contraindications Show Link Image
Interactions Show Link Image
Drug Interactions
Drug Interaction
Cimetidine Cimetidine increases the effect of the narcotic
Naltrexone Naltrexone may precipitate a withdrawal syndrome in opioid dependent individuals
Food Interactions
  • Take without regard to meals. Avoid alcohol.
Pathways Not Available
General References
  1. Drugs.com Link Image
  2. Wikipedia Link Image
  3. RxList Link Image
Organisms Affected
  • Humans and other mammals
Targets
  1. Kappa-type opioid receptor
  2. Mu-type opioid receptor
Drug Target 1 [top]
Target 1 ID 696
Target 1 Name Kappa-type opioid receptor
Target 1 Synonyms
  1. KOR-1
Target 1 Gene Name OPRK1
Target 1 Protein Sequence >Kappa-type opioid receptor 
MDSPIQIFRGEPGPTCAPSACLPPNSSAWFPGWAEPDSNGSAGSEDAQLEPAHISPAIPV
IITAVYSVVFVVGLVGNSLVMFVIIRYTKMKTATNIYIFNLALADALVTTTMPFQSTVYL
MNSWPFGDVLCKIVISIDYYNMFTSIFTLTMMSVDRYIAVCHPVKALDFRTPLKAKIINI
CIWLLSSSVGISAIVLGGTKVREDVDVIECSLQFPDDDYSWWDLFMKICVFIFAFVIPVL
IIIVCYTLMILRLKSVRLLSGSREKDRNLRRITRLVLVVVAVFVVCWTPIHIFILVEALG
STSHSTAALSSYYFCIALGYTNSSLNPILYAFLDENFKRCFRDFCFPLKMRMERQSTSRV
RNTVQDPAYLRDIDGMNKPV
Target 1 Number of Residues 386
Target 1 Molecular Weight 42646
Target 1 Theoretical pI 7.79
Target 1 GO Classification
Function
peptide receptor activity, G-protein coupled
opioid receptor activity
kappa-opioid receptor activity
signal transducer activity
receptor activity
transmembrane receptor activity
G-protein coupled receptor activity
rhodopsin-like receptor activity
Process
cellular process
cell communication
signal transduction
cell surface receptor linked signal transduction
G-protein coupled receptor protein signaling pathway
Component
cell
membrane
intrinsic to membrane
integral to membrane
Target 1 General Function Involved in rhodopsin-like receptor activity
Target 1 Specific Function Inhibits neurotransmitter release by reducing calcium ion currents and increasing potassium ion conductance. Receptor for dynorphins. May play a role in arousal and regulation of autonomic and neuroendocrine functions
Target 1 Pathways Not Available
Target 1 Reactions Not Available
Target 1 Pfam Domain Function
Target 1 Signals
  • None
Target 1 Transmembrane Regions
  • 59-85
  • 96-117
  • 133-154
  • 174-196
  • 223-247
  • 276-299
  • 312-333
Target 1 Essentiality Non-Essential
Target 1 GenBank ID Protein 532060 Link Image
Target 1 UniProtKB/Swiss-Prot ID P41145 Link Image
Target 1 UniProtKB/Swiss-Prot Entry Name OPRK_HUMAN Link Image
Target 1 PDB ID Not Available
Target 1 Cellular Location
  • Membrane
  • multi-pass membrane protein
Target 1 Gene Sequence >1143 bp 
ATGGAATCCCCGATTCAGATCTTCCGCGGGGAGCCTGGCCCTACCTGCGCCCCGAGCGCC
TGCCTGCCCCCCAACAGCAGCGCCTGGTTTCCCGGCTGGGCCGAGCCCGACAGCAACGGC
AGCGCCGGCTCGGAGGACGCGCAGCTGGAGCCCGCGCACATCTCCCCGGCCATCCCGGTC
ATCATCACGGCGGTCTACTCCGTAGTGTTCGTCGTGGGCTTGGTGGGCAACTCGCTGGTC
ATGTTCGTGATCATCCGATACACAAAGATGAAGACAGCAACCAACATTTACATATTTAAC
CTGGCTTTGGCAGATGCTTTAGTTACTACAACCATGCCCTTTCAGAGTACGGTCTACTTG
ATGAATTCCTGGCCTTTTGGGGATGTGCTGTGCAAGATAGTAATTTCCATTGATTACTAC
AACATGTTCACCAGCATCTTCACCTTGACCATGATGAGCGTGGACCGCTACATTGCCGTG
TGCCACCCCGTGAAGGCTTTGGACTTCCGCACACCCTTGAAGGCAAAGATCATCAATATC
TGCATCTGGCTGCTGTCGTCATCTGTTGGCATCTCTGCAATAGTCCTTGGAGGCACCAAA
GTCAGGGAAGACGTCGATGTCATTGAGTGCTCCTTGCAGTTCCCAGATGATGACTACTCC
TGGTGGGACCTCTTCATGAAGATCTGCGTCTTCATCTTTGCCTTCGTGATCCCTGTCCTC
ATCATCATCGTCTGCTACACCCTGATGATCCTGCGTCTCAAGAGCGTCCGGCTCCTTTCT
GGCTCCCGAGAGAAAGATCGCAACCTGCGTAGGATCACCAGACTGGTCCTGGTGGTGGTG
GCGGTTTTCGTCGTCTGCTGGACTCCCATTCACATATTCATCCTGGTGGAGGCTCTGGGG
AGCACCTCCCACAGCACAGCTGCTCTCTCCAGCTATTACTTCTGCATCGCCTTAGGCTAT
ACCAACAGTAGCCTGAATCCCATTCTCTACGCCTTTCTTGATGAAAACTTCAAGCGGTGT
TTCCGGGACTTCTGCTTTCCACTGAAGATGAGGATGGAGCGGCAGAGCACTAGCAGAGTC
CGAAATACAGTTCAGGATCCTGCTTACCTGAGGGACATCGATGGGATGAATAAACCAGTA
TGA
Target 1 GenBank Gene ID
Target 1 GeneCard ID OPRK1 Link Image
Target 1 GenAtlas ID OPRK1 Link Image
Target 1 HGNC ID HGNC:8154 Link Image
Target 1 Chromosome Location 8
Target 1 Locus 8q11.2
Target 1 SNPs SNPJam Report Link Image
Target 1 General References
  1. Li JG, Chen C, Liu-Chen LY: Ezrin-radixin-moesin-binding phosphoprotein-50/Na+/H+ exchanger regulatory factor (EBP50/NHERF) blocks U50,488H-induced down-regulation of the human kappa opioid receptor by enhancing its recycling rate. J Biol Chem. 2002 Jul 26;277(30):27545-52. Epub 2002 May 9. [PubMed Link Image]
  2. Simonin F, Gaveriaux-Ruff C, Befort K, Matthes H, Lannes B, Micheletti G, Mattei MG, Charron G, Bloch B, Kieffer B: kappa-Opioid receptor in humans: cDNA and genomic cloning, chromosomal assignment, functional expression, pharmacology, and expression pattern in the central nervous system. Proc Natl Acad Sci U S A. 1995 Jul 18;92(15):7006-10. [PubMed Link Image]
  3. Zhu J, Chen C, Xue JC, Kunapuli S, DeRiel JK, Liu-Chen LY: Cloning of a human kappa opioid receptor from the brain. Life Sci. 1995;56(9):PL201-7. [PubMed Link Image]
  4. Wang JB, Johnson PS, Wu JM, Wang WF, Uhl GR: Human kappa opiate receptor second extracellular loop elevates dynorphin's affinity for human mu/kappa chimeras. J Biol Chem. 1994 Oct 21;269(42):25966-9. [PubMed Link Image]
  5. Mansson E, Bare L, Yang D: Isolation of a human kappa opioid receptor cDNA from placenta. Biochem Biophys Res Commun. 1994 Aug 15;202(3):1431-7. [PubMed Link Image]
Target 1 Drug References
  1. Chien CC, Pasternak GW: (-)-Pentazocine analgesia in mice: interactions with a sigma receptor system. Eur J Pharmacol. 1995 Dec 27;294(1):303-8. [PubMed Link Image]
Drug Target 2 [top]
Target 2 ID 847
Target 2 Name Mu-type opioid receptor
Target 2 Synonyms
  1. MOR-1
Target 2 Gene Name OPRM1
Target 2 Protein Sequence >Mu-type opioid receptor 
MDSSAAPTNASNCTDALAYSSCSPAPSPGSWVNLSHLDGNLSDPCGPNRTDLGGRDSLCP
PTGSPSMITAITIMALYSIVCVVGLFGNFLVMYVIVRYTKMKTATNIYIFNLALADALAT
STLPFQSVNYLMGTWPFGTILCKIVISIDYYNMFTSIFTLCTMSVDRYIAVCHPVKALDF
RTPRNAKIINVCNWILSSAIGLPVMFMATTKYRQGSIDCTLTFSHPTWYWENLLKICVFI
FAFIMPVLIITVCYGLMILRLKSVRMLSGSKEKDRNLRRITRMVLVVVAVFIVCWTPIHI
YVIIKALVTIPETTFQTVSWHFCIALGYTNSCLNPVLYAFLDENFKRCFREFCIPTSSNI
EQQNSTRIRQNTRDHPSTANTVDRTNHQLENLEAETAPLP
Target 2 Number of Residues 406
Target 2 Molecular Weight 44780
Target 2 Theoretical pI 8.29
Target 2 GO Classification
Function
peptide receptor activity, G-protein coupled
opioid receptor activity
mu-opioid receptor activity
signal transducer activity
receptor activity
transmembrane receptor activity
G-protein coupled receptor activity
rhodopsin-like receptor activity
Process
cellular process
cell communication
signal transduction
cell surface receptor linked signal transduction
G-protein coupled receptor protein signaling pathway
Component
cell
membrane
intrinsic to membrane
integral to membrane
Target 2 General Function Involved in rhodopsin-like receptor activity
Target 2 Specific Function Inhibits neurotransmitter release by reducing calcium ion currents and increasing potassium ion conductance. Receptor for beta-endorphin
Target 2 Pathways Not Available
Target 2 Reactions Not Available
Target 2 Pfam Domain Function
Target 2 Signals
  • None
Target 2 Transmembrane Regions
  • 67-96
  • 106-123
  • 146-165
  • 196-211
  • 237-259
  • 283-305
  • 314-330
Target 2 Essentiality Non-Essential
Target 2 GenBank ID Protein 452073 Link Image
Target 2 UniProtKB/Swiss-Prot ID P35372 Link Image
Target 2 UniProtKB/Swiss-Prot Entry Name OPRM_HUMAN Link Image
Target 2 PDB ID Not Available
Target 2 Cellular Location
  • Membrane
  • multi-pass membrane protein
Target 2 Gene Sequence >1203 bp 
ATGGACAGCAGCGCTGCCCCCACGAACGCCAGCAATTGCACTGATGCCTTGGCGTACTCA
AGTTGCTCCCCAGCACCCAGCCCCGGTTCCTGGGTCAACTTGTCCCACTTAGATGGCAAC
CTGTCCGACCCATGCGGTCCGAACCGCACCAACCTGGGCGGGAGAGACAGCCTGTGCCCT
CCGACCGGCAGTCCCTCCATGATCACGGCCATCACGATCATGGCCCTCTACTCCATCGTG
TGCGTGGTGGGGCTCTTCGGAAACTTCCTGGTCATGTATGTGATTGTCAGATACACCAAG
ATGAAGACTGCCACCAACATCTACATTTTCAACCTTGCTCTGGCAGATGCCTTAGCCACC
AGTACCCTGCCCTTCCAGAGTGTGAATTACCTAATGGGAACATGGCCATTTGGAACCATC
CTTTGCAAGATAGTGATCTCCATAGATTACTATAACATGTTCACCAGCATATTCACCCTC
TGCACCATGAGTGTTGATCGATACATTGCAGTCTGCCACCCTGTCAAGGCCTTAGATTTC
CGTACTCCCCGAAATGCCAAAATTATCAATGTCTGCAACTGGATCCTCTCTTCAGCCATT
GGTCTTCCTGTAATGTTCATGGCTACAACAAAATACAGGCAAGGTTCCATAGATTGTACA
CTAACATTCTCTCATCCAACCTGGTACTGGGAAAACCTCGTGAAGATCTGTGTTTTCATC
TTCGCCTTCATTATGCCAGTGCTCATCATTACCGTGTGCTATGGACTGATGATCTTGCGC
CTCAAGAGTGTCCGCATGCTCTCTGGCTCCAAAGAAAAGGACAGGAATCTTCGAAGGATC
ACCAGGATGGTGCTGGTGGTGGTGGCTGTGTTCATCGTCTGCTGGACTCCCATTCACATT
TACGTCATCATTAAAGCCTTGGTTACAATCCCAGAAACTACGTTCCAGACTGTTTCTTGG
CACTTCTGCATTGCTCTAGGTTACACAAACAGCTGCCTCAACCCAGTCCTTTATGCATTT
CTGGATGAAAACTTCAAACGATGCTTCAGAGAGTTCTGTATCCCAACCTCTTCCAACATT
GAGCAACAAAACTCCACTCGAATTCGTCAGAACACTAGAGACCACCCCTCCACGGCCAAT
ACAGTGGATAGAACTAATCATCAGCTAGAAAATCTGGAAGCAGAAACTGCTCCGTTGCCC
TAA
Target 2 GenBank Gene ID
Target 2 GeneCard ID OPRM1 Link Image
Target 2 GenAtlas ID OPRM1 Link Image
Target 2 HGNC ID HGNC:8156 Link Image
Target 2 Chromosome Location 6
Target 2 Locus 6q24-q25
Target 2 SNPs SNPJam Report Link Image
Target 2 General References
  1. Uhl GR, Sora I, Wang Z: The mu opiate receptor as a candidate gene for pain: polymorphisms, variations in expression, nociception, and opiate responses. Proc Natl Acad Sci U S A. 1999 Jul 6;96(14):7752-5. [PubMed Link Image]
  2. Chuang TK, Killam KF Jr, Chuang LF, Kung HF, Sheng WS, Chao CC, Yu L, Chuang RY: Mu opioid receptor gene expression in immune cells. Biochem Biophys Res Commun. 1995 Nov 22;216(3):922-30. [PubMed Link Image]
  3. Mestek A, Hurley JH, Bye LS, Campbell AD, Chen Y, Tian M, Liu J, Schulman H, Yu L: The human mu opioid receptor: modulation of functional desensitization by calcium/calmodulin-dependent protein kinase and protein kinase C. J Neurosci. 1995 Mar;15(3 Pt 2):2396-406. [PubMed Link Image]
  4. Wang JB, Johnson PS, Persico AM, Hawkins AL, Griffin CA, Uhl GR: Human mu opiate receptor. cDNA and genomic clones, pharmacologic characterization and chromosomal assignment. FEBS Lett. 1994 Jan 31;338(2):217-22. [PubMed Link Image]
  5. Bare LA, Mansson E, Yang D: Expression of two variants of the human mu opioid receptor mRNA in SK-N-SH cells and human brain. FEBS Lett. 1994 Nov 7;354(2):213-6. [PubMed Link Image]
  6. Bergen AW, Kokoszka J, Peterson R, Long JC, Virkkunen M, Linnoila M, Goldman D: Mu opioid receptor gene variants: lack of association with alcohol dependence. Mol Psychiatry. 1997 Oct-Nov;2(6):490-4. [PubMed Link Image]
  7. Bond C, LaForge KS, Tian M, Melia D, Zhang S, Borg L, Gong J, Schluger J, Strong JA, Leal SM, Tischfield JA, Kreek MJ, Yu L: Single-nucleotide polymorphism in the human mu opioid receptor gene alters beta-endorphin binding and activity: possible implications for opiate addiction. Proc Natl Acad Sci U S A. 1998 Aug 4;95(16):9608-13. [PubMed Link Image]
Target 2 Drug References
  1. Saha N, Datta H, Sharma PL: Effects of morphine, buprenorphine, pentazocine and nalorphine on acquisition and extinction of active avoidance responses in rats. Indian J Physiol Pharmacol. 1990 Jul;34(3):179-82. [PubMed Link Image]
  2. Levine JD, Gordon NC: Synergism between the analgesic actions of morphine and pentazocine. Pain. 1988 Jun;33(3):369-72. [PubMed Link Image]
  3. Martin BR, Katzen JS, Woods JA, Tripathi HL, Harris LS, May EL: Stereoisomers of [3H]-N-allylnormetazocine bind to different sites in mouse brain. J Pharmacol Exp Ther. 1984 Dec;231(3):539-44. [PubMed Link Image]
  4. Kamei J, Iwamoto Y, Misawa M, Nagase H, Kasuya Y: Effects of diabetes on the antinociceptive effect of (+/-)pentazocine in mice. Res Commun Chem Pathol Pharmacol. 1994 Apr;84(1):105-10. [PubMed Link Image]
  5. Picker MJ, Benyas S, Horwitz JA, Thompson K, Mathewson C, Smith MA: Discriminative stimulus effects of butorphanol: influence of training dose on the substitution patterns produced by Mu, Kappa and Delta opioid agonists. J Pharmacol Exp Ther. 1996 Dec;279(3):1130-41. [PubMed Link Image]

This project is supported by Genome Alberta & Genome Canada, a not-for-profit organization that is leading Canada's national genomics strategy with $600 million in funding from the federal government. This project is also supported in part by GenomeQuest, Inc., an enterprise genomic information company serving the life science community.