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Showing drug card for Losartan (DB00678)

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Version 2.5
Creation Date 2005-06-13 13:24:05
Update Date 2009-06-23 18:05:50
Primary Accession Number DB00678
Secondary Accession Number
  • APRD00052
Name Losartan
Drug Type
  • Approved
  • Small Molecule
Description An antagonist of angiotensin type 1 receptor with antihypertensive activity due to the reduced pressor effect of angiotensin II. [PubChem]
Synonyms
  1. DUP 89
  2. Losartan Potassium
Brand Names
  1. Cozaar
  2. Hyzaar
  3. Lacidipine
  4. Lortaan
Brand Mixtures
  1. Anzaplus (Losartan + Hydrochlorothiazide)
  2. Hyzaar (Losartan + Hydrochlorothiazide)
Chemical IUPAC Name [2-butyl-5-chloro-3-[[4-[2-(2H-tetrazol-5-yl)phenyl]phenyl]methyl]imidazol-4-yl]methanol
Chemical Formula C22H23ClN6O
Chemical Structure Structure
CAS Registry Number 114798-26-4
InChI Identifier InChI=1/C22H23ClN6O/c1-2-3-8-20-24-21(23)19(14-30)29(20)13-15-9-11-16(12-10-15)17-6-4-5-7-18(17)22-25-27-28-26-22/h4-7,9-12,30H,2-3,8,13-14H2,1H3,(H,25,26,27,28)/f/h27H
InChI Key PSIFNNKUMBGKDQ-LELJVTLKCP
KEGG Drug Not Available
KEGG Compound C07072 Link Image
PubChem Compound 3961 Link Image
PubChem Substance 205151 Link Image
ChEBI ID 6541 Link Image
PharmGKB ID PA450268 Link Image
HET ID Not Available
GenBank ID Not Available
Drug ID Number [DIN] 02182882 Link Image
RxList Link http://www.rxlist.com/cgi/generic/losar.htm Link Image
PDRhealth Link Not Available
Wikipedia Link http://en.wikipedia.org/wiki/Losartan Link Image
FDA Label
Material Safety Data Sheet (MSDS)
Synthesis Reference D. J. Carini et al., U.S. Pat. 5,138,069 (1992)
Average Molecular Weight 422.9110
Monoisotopic Molecular Weight 422.1622
State Solid
Melting Point 183.5-184.5 oC
Experimental Water Solubility 0.82 mg/L Source: PhysProp
Predicted Water Solubility 4.70e-03 mg/mL Calculated using ALOGPS
Experimental LogP/Hydrophobicity 6.1 Source: PhysProp
Predicted LogP 4.51 Calculated using ALOGPS
Experimental LogS Not Available
Predicted LogS -4.95 Calculated using ALOGPS
Experimental Caco2 Permeability Not Available
pKa/Isoelectric Point Not Available
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 CCCCC1=NC(Cl)=C(CO)N1CC1=CC=C(C=C1)C1=CC=CC=C1C1=NNN=N1
Canonical SMILES CCCCC1=NC(Cl)=C(CO)N1CC1=CC=C(C=C1)C1=CC=CC=C1C1=NNN=N1
Drug Category
  • Angiotensin II Receptor Antagonists
  • Angiotensin II Type 1 Receptor Blockers
  • Anti-Arrhythmia Agents
  • Antiarrhythmic Agents
  • Antihypertensive Agents
ATC Codes
AHFS Codes
  • 24:32.08
Indication For the treatment of hypertension.
Pharmacology Losartan is the first of a class of antihypertensive agents called angiotensin II (AG II) receptor antagonists. It is, along with its longer acting active metabolite (E-3174), a specific and selective AT1 receptor antagonist. Losartan blocks the vasoconstrictor and aldosterone-secreting effects of angiotensin II by selectively blocking the binding of angiotensin II to the AT1 receptor found in many tissues, (e.g., vascular smooth muscle, adrenal gland).
Mechanism of Action Losartan and its longer acting active metabolite (E-3174) interfere with the binding of angiotensin II to the angiotensin II AT1-receptor by, themselves, binding reversibly to the receptors in vascular smooth muscle and the adrenal gland. As angiotensin II is a vasoconstrictor, which also stimulates the synthesis and release of aldosterone, blockage of its effects results in decreases in systemic vascular resistance. Neither Losartan or its metabolite inhibit the angiotensin converting enzyme, other hormone receptors, or ion channels.
Absorption Well absorbed, the systemic bioavailability of losartan is approximately 33%
Toxicity Hypotension and tachycardia; Bradycardia could occur from parasympathetic (vagal) stimulation, LD50= 1000 mg/kg (orally in rat)
Protein Binding 99.7%
Biotransformation Hepatic. Oxidation of the 5-hydroxymethyl group on the imidazole ring results in the active metabolite of losartan.
Half Life 2 hours
Dosage Forms
Form Route
Tablet Oral
Patient Information Show Link Image
Contraindications Show Link Image
Interactions Show Link Image
Drug Interactions
Drug Interaction
Amiloride Increased risk of hyperkaliemia
Drospirenone Increased risk of hyperkaliemia
Indomethacin Indomethacin decreases the effect of losartan
Lithium Losartan increases serum levels of lithium
Potassium Increased risk of hyperkaliemia
Rifampin Rifampin decreases the effect of losartan
Spironolactone Increased risk of hyperkaliemia
Triamterene Increased risk of hyperkaliemia
Food Interactions
  • Take without regard to meals. Take at same time each day. Food delays absorption, but does not affect the extent of absorption.
Pathways Not Available
General References
  1. Dahlof B, Devereux RB, Kjeldsen SE, Julius S, Beevers G, de Faire U, Fyhrquist F, Ibsen H, Kristiansson K, Lederballe-Pedersen O, Lindholm LH, Nieminen MS, Omvik P, Oparil S, Wedel H: Cardiovascular morbidity and mortality in the Losartan Intervention For Endpoint reduction in hypertension study (LIFE): a randomised trial against atenolol. Lancet. 2002 Mar 23;359(9311):995-1003. [PubMed Link Image]
  2. Guo ZX, Qiu MC: [Losartan downregulates the expression of transforming growth factor beta type I and type II receptors in kidney of diabetic rat] Zhonghua Nei Ke Za Zhi. 2003 Jun;42(6):403-8. [PubMed Link Image]
  3. Habashi JP, Judge DP, Holm TM, Cohn RD, Loeys BL, Cooper TK, Myers L, Klein EC, Liu G, Calvi C, Podowski M, Neptune ER, Halushka MK, Bedja D, Gabrielson K, Rifkin DB, Carta L, Ramirez F, Huso DL, Dietz HC: Losartan, an AT1 antagonist, prevents aortic aneurysm in a mouse model of Marfan syndrome. Science. 2006 Apr 7;312(5770):117-21. [PubMed Link Image]
  4. Drugs.com Link Image
  5. Wikipedia Link Image
  6. RxList Link Image
Organisms Affected
  • Humans and other mammals
Phase 1 Metabolizing Enzymes
  1. Cytochrome P450 3A4 (CYP3A4)
  2. Cytochrome P450 2C9 (CYP2C9)
Targets
  1. Type-1 angiotensin II receptor
Phase 1 Metabolizing Enzyme 1 [top]
Enzyme 1 Name Cytochrome P450 3A4 (CYP3A4)
Enzyme 1 Gene Name CYP3A4
Enzyme 1 SwissProt ID P08684 Link Image
Enzyme 1 SNPs SNPJam Report Link Image
Enzyme 1 Protein Sequence >sp|P08684|CP3A4_HUMAN Cytochrome P450 3A4 (EC 1.14.13.67) 
ALIPDLAMETWLLLAVSLVLLYLYGTHSHGLFKKLGIPGPTPLPFLGNILSYHKGFCMFD
MECHKKYGKVWGFYDGQQPVLAITDPDMIKTVLVKECYSVFTNRRPFGPVGFMKSAISIA
EDEEWKRLRSLLSPTFTSGKLKEMVPIIAQYGDVLVRNLRREAETGKPVTLKDVFGAYSM
DVITSTSFGVNIDSLNNPQDPFVENTKKLLRFDFLDPFFLSITVFPFLIPILEVLNICVF
PREVTNFLRKSVKRMKESRLEDTQKHRVDFLQLMIDSQNSKETESHKALSDLELVAQSII
FIFAGYETTSSVLSFIMYELATHPDVQQKLQEEIDAVLPNKAPPTYDTVLQMEYLDMVVN
ETLRLFPIAMRLERVCKKDVEINGMFIPKGWVVMIPSYALHRDPKYWTEPEKFLPERFSK
KNKDNIDPYIYTPFGSGPRNCIGMRFALMNMKLALIRVLQNFSFKPCKETQIPLKLSLGG
LLQPEKPVVLKVESRDGTVSGA
Phase 1 Metabolizing Enzyme 2 [top]
Enzyme 2 Name Cytochrome P450 2C9 (CYP2C9)
Enzyme 2 Gene Name CYP2C9
Enzyme 2 SwissProt ID P11712 Link Image
Enzyme 2 SNPs SNPJam Report Link Image
Enzyme 2 Protein Sequence >sp|P11712|CP2C9_HUMAN Cytochrome P450 2C9 (EC 1.14.13.80) 
MDSLVVLVLCLSCLLLLSLWRQSSGRGKLPPGPTPLPVIGNILQIGIKDISKSLTNLSKV
YGPVFTLYFGLKPIVVLHGYEAVKEALIDLGEEFSGRGIFPLAERANRGFGIVFSNGKKW
KEIRRFSLMTLRNFGMGKRSIEDRVQEEARCLVEELRKTKASPCDPTFILGCAPCNVICS
IIFHKRFDYKDQQFLNLMEKLNENIKILSSPWIQICNNFSPIIDYFPGTHNKLLKNVAFM
KSYILEKVKEHQESMDMNNPQDFIDCFLMKMEKEKHNQPSEFTIESLENTAVDLFGAGTE
TTSTTLRYALLLLLKHPEVTAKVQEEIERVIGRNRSPCMQDRSHMPYTDAVVHEVQRYID
LLPTSLPHAVTCDIKFRNYLIPKGTTILISLTSVLHDNKEFPNPEMFDPHHFLDEGGNFK
KSKYFMPFSAGKRICVGEALAGMELFLFLTSILQNFNLKSLVDPKNLDTTPVVNGFASVP
PFYQLCFIPV
Drug Target 1 [top]
Target 1 ID 70
Target 1 Name Type-1 angiotensin II receptor
Target 1 Synonyms
  1. AT1
  2. AT1AR
  3. AT1BR
Target 1 Gene Name AGTR1
Target 1 Protein Sequence >Type-1 angiotensin II receptor 
MILNSSTEDGIKRIQDDCPKAGRHNYIFVMIPTLYSIIFVVGIFGNSLVVIVIYFYMKLK
TVASVFLLNLALADLCFLLTLPLWAVYTAMEYRWPFGNYLCKIASASVSFNLYASVFLLT
CLSIDRYLAIVHPMKSRLRRTMLVAKVTCIIIWLLAGLASLPAIIHRNVFFIENTNITVC
AFHYESQNSTLPIGLGLTKNILGFLFPFLIILTSYTLIWKALKKAYEIQKNKPRNDDIFK
IIMAIVLFFFFSWIPHQIFTFLDVLIQLGIIRDCRIADIVDTAMPITICIAYFNNCLNPL
FYGFLGKKFKRYFLQLLKYIPPKAKSHSNLSTKMSTLSYRPSDNVSSSTKKPAPCFEVE
Target 1 Number of Residues 364
Target 1 Molecular Weight 41062
Target 1 Theoretical pI 9.71
Target 1 GO Classification
Function
G-protein chemoattractant receptor activity
chemokine receptor activity
C-X-C chemokine receptor activity
bradykinin receptor activity
signal transducer activity
receptor activity
transmembrane receptor activity
G-protein coupled receptor activity
rhodopsin-like receptor activity
peptide receptor activity, G-protein coupled
angiotensin receptor activity
angiotensin type II 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 angiotensin type II receptor activity
Target 1 Specific Function Receptor for angiotensin II. Mediates its action by association with G proteins that activate a phosphatidylinositol- calcium second messenger system
Target 1 Pathways Not Available
Target 1 Reactions Not Available
Target 1 Pfam Domain Function
Target 1 Signals
  • None
Target 1 Transmembrane Regions
  • 28-52
  • 65-87
  • 103-124
  • 143-162
  • 193-214
  • 241-262
  • 276-296
Target 1 Essentiality Non-Essential
Target 1 GenBank ID Protein 179122 Link Image
Target 1 UniProtKB/Swiss-Prot ID P30556 Link Image
Target 1 UniProtKB/Swiss-Prot Entry Name AGTR1_HUMAN Link Image
Target 1 PDB ID Not Available
Target 1 Cellular Location
  • Membrane
  • multi-pass membrane protein
Target 1 Gene Sequence >1080 bp 
ATGATTCTCAACTCTTCTACTGAAGATGGTATTAAAAGAATCCAAGATGATTGTCCCAAA
GCTGGAAGGCATAATTACATATTTGTCATGATTCCTACTTTATACAGTATCATCTTTGTG
GTGGGAATATTTGGAAACAGCTTGGTGGTGATAGTCATTTACTTTTATATGAAGCTGAAG
ACTGTGGCCAGTGTTTTTCTTTTGAATTTAGCACTGGCTGACTTATGCTTTTTACTGACT
TTGCCACTATGGGCTGTCTACACAGCTATGGAATACCGCTGGCCCTTTGGCAATTACCTA
TGTAAGATTGCTTCAGCCAGCGTCAGTTTCAACCTGTACGCTAGTGTGTTTCTACTCACG
TGTCTCAGCATTGATCGATACCTGGCTATTGTTCACCCAATGAAGTCCCGCCTTCGACGC
ACAATGCTTGTAGCCAAAGTCACCTGCATCATCATTTGGCTGCTGGCAGGCTTGGCCAGT
TTGCCAGCTATAATCCATCGAAATGTATTTTTCATTGAGAACACCAATATTACAGTTTGT
GCTTTCCATTATGAGTCCCAAAATTCAACCCTCCCGATAGGGCTGGGCCTGACCAAAAAT
ATACTGGGTTTCCTGTTTCCTTTTCTGATCATTCTTACAAGTTATACTCTTATTTGGAAG
GCCCTAAAGAAGGCTTATGAAATTCAGAAGAACAAACCAAGAAATGATGATATTTTTAAG
ATAATTATGGCAATTGTGCTTTTCTTTTTCTTTTCCTGGATTCCCCACCAAATATTCACT
TTTCTGGATGTATTGATTCAACTAGGCATCATACGTGACTGTAGAATTGCAGATATTGTG
GACACGGCCATGCCTATCACCATTTGTATAGCTTATTTTAACAATTGCCTGAATCCTCTT
TTTTATGGCTTTCTGGGGAAAAAATTTAAAAGATATTTTCTCCAGCTTCTAAAATATATT
CCCCCAAAAGCCAAATCCCACTCAAACCTTTCAACAAAAATGAGCACGCTTTCCTACCGC
CCCTCAGATAATGTAAGCTCATCCACCAAGAAGCCTGCACCATGTTTTGAGGTTGAGTGA
Target 1 GenBank Gene ID
Target 1 GeneCard ID AGTR1 Link Image
Target 1 GenAtlas ID AGTR1 Link Image
Target 1 HGNC ID HGNC:336 Link Image
Target 1 Chromosome Location 3
Target 1 Locus 3q21-q25
Target 1 SNPs SNPJam Report Link Image
Target 1 General References
  1. Mauzy CA, Hwang O, Egloff AM, Wu LH, Chung FZ: Cloning, expression, and characterization of a gene encoding the human angiotensin II type 1A receptor. Biochem Biophys Res Commun. 1992 Jul 15;186(1):277-84. [PubMed Link Image]
  2. Curnow KM, Pascoe L, White PC: Genetic analysis of the human type-1 angiotensin II receptor. Mol Endocrinol. 1992 Jul;6(7):1113-8. [PubMed Link Image]
  3. Furuta H, Guo DF, Inagami T: Molecular cloning and sequencing of the gene encoding human angiotensin II type 1 receptor. Biochem Biophys Res Commun. 1992 Feb 28;183(1):8-13. [PubMed Link Image]
  4. Takayanagi R, Ohnaka K, Sakai Y, Nakao R, Yanase T, Haji M, Inagami T, Furuta H, Gou DF, Nakamuta M, et al.: Molecular cloning, sequence analysis and expression of a cDNA encoding human type-1 angiotensin II receptor. Biochem Biophys Res Commun. 1992 Mar 16;183(2):910-6. [PubMed Link Image]
  5. Bergsma DJ, Ellis C, Kumar C, Nuthulaganti P, Kersten H, Elshourbagy N, Griffin E, Stadel JM, Aiyar N: Cloning and characterization of a human angiotensin II type 1 receptor. Biochem Biophys Res Commun. 1992 Mar 31;183(3):989-95. [PubMed Link Image]
  6. Nawata H, Takayanagi R, Ohnaka K, Sakai Y, Imasaki K, Yanase T, Ikuyama S, Tanaka S, Ohe K: Type 1 angiotensin II receptors of adrenal tumors. Steroids. 1995 Jan;60(1):28-34. [PubMed Link Image]
  7. Konishi H, Kuroda S, Inada Y, Fujisawa Y: Novel subtype of human angiotensin II type 1 receptor: cDNA cloning and expression. Biochem Biophys Res Commun. 1994 Mar 15;199(2):467-74. [PubMed Link Image]
Target 1 Drug References
  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [PubMed Link Image]
  2. Anand-Srivastava MB, Palaparti A: Angiotensin-II-induced enhanced expression of Gi proteins is attenuated by losartan in A10 vascular smooth muscle cells: role of AT1 receptors. Can J Physiol Pharmacol. 2003 Feb;81(2):150-8. [PubMed Link Image]
  3. Rocha I, Bras-Rosario L, Amparo-Barros M, Silva-Carvalho L: Angiotensin AT1 receptor antagonist losartan and the defence reaction in the anaesthetised rat. Effect on the carotid chemoreflex. Exp Physiol. 2003 May;88(3):309-14. [PubMed Link Image]
  4. Sardo MA, Castaldo M, Cinquegrani M, Bonaiuto M, Fontana L, Campo S, Campo GM, Altavilla D, Saitta A: Effects of AT1 receptor antagonist losartan on sICAM-1 and TNF-alpha levels in uncomplicated hypertensive patients. Angiology. 2004 Mar-Apr;55(2):195-203. [PubMed Link Image]
  5. Guan J, Cheng DY, Chen XJ, Zhang Y, Wang H, Su QL: [The effects of losartan on pulmonary arterial collagen and AT1 in chronic hypoxic rats] Sichuan Da Xue Xue Bao Yi Xue Ban. 2004 Nov;35(6):774-7. [PubMed Link Image]
  6. Dickstein K, Timmermans P, Segal R: Losartan: a selective angiotensin II type 1 (AT1) receptor antagonist for the treatment of heart failure. Expert Opin Investig Drugs. 1998 Nov;7(11):1897-914. [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.