Identification

Name
Tadalafil
Accession Number
DB00820
Description

Tadalafil is an orally administered drug used to treat male erectile dysfunction (impotence). It is marketed worldwide under the brand name Cialis. It is a phosphodiesterase 5 (PDE5) inhibitor. Tadalafil's distinguishing pharmacologic feature is its longer half-life (17.5 hours) compared with Viagra and Levitra (4-5 hours). This longer half-life results in a longer duration of action and is, in part, responsible for the Cialis nickname of the "weekend pill." This longer half-life also is the basis of current investigation for tadalafil's use in pulmonary arterial hypertension as a once-daily therapy.

Type
Small Molecule
Groups
Approved, Investigational
Structure
Thumb
Weight
Average: 389.404
Monoisotopic: 389.137556111
Chemical Formula
C22H19N3O4
Synonyms
  • (6R-trans)-6-(1,3-Benzodioxol-5-yl)-2,3,6,7,12,12a-hexahydro-2-methyl-pyrazino(1',2':1,6)pyrido(3,4-b)indole-1,4-dione
  • (6R,12aR)-2,3,6,7,12,12a-Hexahydro-2-methyl-6-(3,4-(methylenedioxy)phenyl) pyrazino(1',2':1,6)pyrido(3,4-b)indole-1,4-dione
  • Tadalafil
  • Tadalafilo
External IDs
  • GF 196960
  • IC-351
  • IC351
  • ICOS 351

Pharmacology

Indication

Used for the treatment of erectile dysfunction.

Associated Conditions
Contraindications & Blackbox Warnings
Learn about our commercial Contraindications & Blackbox Warnings data.
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Pharmacodynamics

Tadalafil is used to treat male erectile dysfunction (impotence) and pulmonary arterial hypertension (PAH). Part of the physiological process of erection involves the release of nitric oxide (NO) in the corpus cavernosum. This then activates the enzyme guanylate cyclase which results in increased levels of cyclic guanosine monophosphate (cGMP), leading to smooth muscle relaxation in the corpus cavernosum, resulting in increased inflow of blood and an erection. Tadalafil is a potent and selective inhibitor of cGMP specific phosphodiesterase type 5 (PDE5) which is responsible for degradation of cGMP in the corpus cavernosum. This means that, with tadalafil on board, normal sexual stimulation leads to increased levels of cGMP in the corpus cavernosum which leads to better erections. Without sexual stimulation and no activation of the NO/cGMP system, tadalafil should not cause an erection.

Mechanism of action

Penile erection during sexual stimulation is achieved by the relaxation of penile arteries and corpus cavernosal smooth muscles, leading to increased blood flow to the organ. This response is mediated by the release of nitric oxide (NO) from nerve terminals and endothelial cells, which stimulates the synthesis of cGMP in smooth muscle cells. Cyclic GMP causes smooth muscle relaxation and increased blood flow into the corpus cavernosum, and is degraded by the cGMP specific phosphodiesterase type 5 (PDE5) in the corpus cavernosum located around the penis. Tadalafil inhibits PDE5 and thereby enhances erectile function by increasing the amount of cGMP available.

TargetActionsOrganism
AcGMP-specific 3',5'-cyclic phosphodiesterase
inhibitor
Humans
UDual 3',5'-cyclic-AMP and -GMP phosphodiesterase 11A
inhibitor
Humans
Absorption

After single oral-dose administration, the maximum observed plasma concentration (Cmax) of tadalafil is achieved between 30 minutes and 6 hours (median time of 2 hours). Absolute bioavailability of tadalafil following oral dosing has not been determined.

Volume of distribution
  • 63 L
Protein binding

94%

Metabolism

Tadalafil is predominantly metabolized by CYP3A4 to a catechol metabolite. The catechol metabolite undergoes extensive methylation and glucuronidation to form the methylcatechol and methylcatechol glucuronide conjugate, respectively. In vitro data suggests the metabolites are not expected to be pharmacologically active at observed metabolite concentrations.

Route of elimination

Tadalafil is excreted predominantly as metabolites, mainly in the feces (approximately 61% of the dose) and to a lesser extent in the urine (approximately 36% of the dose).

Half-life

17.5 hours

Clearance
  • oral cl=2.5 L/hr
Adverse Effects
Learn about our commercial Adverse Effects data.
Learn More
Toxicity

Oral, Rat LD50 = 2000 mg/kg, no deaths or toxicity.

Affected organisms
  • Humans and other mammals
Pathways
Not Available
Pharmacogenomic Effects/ADRs
Not Available

Interactions

Drug Interactions
This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.
DrugInteraction
AbacavirTadalafil may decrease the excretion rate of Abacavir which could result in a higher serum level.
AbametapirThe serum concentration of Tadalafil can be increased when it is combined with Abametapir.
AbataceptThe metabolism of Tadalafil can be increased when combined with Abatacept.
AcalabrutinibThe metabolism of Tadalafil can be decreased when combined with Acalabrutinib.
AcarboseAcarbose may decrease the excretion rate of Tadalafil which could result in a higher serum level.
AcebutololTadalafil may increase the antihypertensive activities of Acebutolol.
AceclofenacAceclofenac may decrease the excretion rate of Tadalafil which could result in a higher serum level.
AcemetacinAcemetacin may decrease the excretion rate of Tadalafil which could result in a higher serum level.
AcetaminophenAcetaminophen may decrease the excretion rate of Tadalafil which could result in a higher serum level.
AcetazolamideAcetazolamide may increase the excretion rate of Tadalafil which could result in a lower serum level and potentially a reduction in efficacy.
Additional Data Available
  • Extended Description
    Extended Description

    Extended description of the mechanism of action and particular properties of each drug interaction.

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  • Severity
    Severity

    A severity rating for each drug interaction, from minor to major.

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  • Evidence Level
    Evidence Level

    A rating for the strength of the evidence supporting each drug interaction.

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  • Action
    Action

    An effect category for each drug interaction. Know how this interaction affects the subject drug.

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Food Interactions
  • Avoid excessive or chronic alcohol consumption. Ingesting excess amounts of alcohol (more than four drinks in a short time) may potentiate the hypotension and dizziness caused by tadalafil.
  • Avoid grapefruit products. Tadalafil is metabolized by CYP3A4, and grapefruit products are CYP3A4 inhibitors; therefore, coadministration may increase serum levels of tadalafil and result in increased hypotension.
  • Take with or without food.

Products

Product Images
Brand Name Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing EndRegionImage
Act TadalafilTabletOralTEVA Canada Limited2016-07-12Not applicableCanada flag
Act TadalafilTabletOralTEVA Canada Limited2016-07-12Not applicableCanada flag
Act TadalafilTabletOralTEVA Canada Limited2016-07-12Not applicableCanada flag
Act TadalafilTabletOralTEVA Canada Limited2016-07-12Not applicableCanada flag
AdcircaTablet20 mg/1OralAvera McKennan Hospital2015-10-282017-05-24US flag
AdcircaTablet20 mg/1OralUnited Therapeutics Corporation2009-05-22Not applicableUS flag
AdcircaTablet20 mgOralEli Lilly & Co. Ltd.2010-01-19Not applicableCanada flag
AdcircaTablet20 mg/1OralAphena Pharma Solutions - Tennessee, LLC2009-05-22Not applicableUS flag
AdcircaTablet, film coated20 mgOralEli Lilly Nederland B.V.2008-10-01Not applicableEU flag
AdcircaTablet, film coated20 mgOralEli Lilly Nederland B.V.2008-10-01Not applicableEU flag
Additional Data Available
  • Application Number
    Application Number

    A unique ID assigned by the FDA when a product is submitted for approval by the labeller.

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  • Product Code
    Product Code

    A governmentally-recognized ID which uniquely identifies the product within its regulatory market.

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Generic Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing EndRegionImage
Ag-tadalafilTabletOralAngita Pharma Inc.Not applicableNot applicableCanada flag
Ag-tadalafilTabletOralAngita Pharma Inc.2019-11-21Not applicableCanada flag
Ag-tadalafilTabletOralAngita Pharma Inc.Not applicableNot applicableCanada flag
Ag-tadalafilTabletOralAngita Pharma Inc.Not applicableNot applicableCanada flag
AlyqTablet, film coated20 mg/1OralAvKARE, Inc.2019-02-18Not applicableUS flag
AlyqTablet, film coated20 mg/1OralTeva Pharmaceuticals USA, Inc.2019-02-06Not applicableUS flag
Apo-tadalafilTabletOralApotex Corporation2016-07-12Not applicableCanada flag
Apo-tadalafilTabletOralApotex Corporation2016-07-12Not applicableCanada flag
Apo-tadalafilTabletOralApotex Corporation2016-07-12Not applicableCanada flag
Apo-tadalafilTabletOralApotex Corporation2016-07-12Not applicableCanada flag
Additional Data Available
  • Application Number
    Application Number

    A unique ID assigned by the FDA when a product is submitted for approval by the labeller.

    Learn more
  • Product Code
    Product Code

    A governmentally-recognized ID which uniquely identifies the product within its regulatory market.

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Categories

ATC Codes
G04BE08 — TadalafilC02KX52 — Ambrisentan and tadalafilG04CA54 — Tamsulosin and tadalafil
Drug Categories
Chemical TaxonomyProvided by Classyfire
Description
This compound belongs to the class of organic compounds known as beta carbolines. These are compounds containing a 9H-pyrido[3,4-b]indole moiety.
Kingdom
Organic compounds
Super Class
Organoheterocyclic compounds
Class
Indoles and derivatives
Sub Class
Pyridoindoles
Direct Parent
Beta carbolines
Alternative Parents
3-alkylindoles / Alpha amino acids and derivatives / Benzodioxoles / 2,5-dioxopiperazines / N-methylpiperazines / Benzenoids / Tertiary carboxylic acid amides / Pyrroles / Heteroaromatic compounds / Lactams
show 8 more
Substituents
1,4-diazinane / 2,5-dioxopiperazine / 3-alkylindole / Acetal / Alpha-amino acid or derivatives / Aromatic heteropolycyclic compound / Azacycle / Benzenoid / Benzodioxole / Beta-carboline
show 20 more
Molecular Framework
Aromatic heteropolycyclic compounds
External Descriptors
benzodioxoles, pyrazinopyridoindole (CHEBI:71940)

Chemical Identifiers

UNII
742SXX0ICT
CAS number
171596-29-5
InChI Key
WOXKDUGGOYFFRN-IIBYNOLFSA-N
InChI
InChI=1S/C22H19N3O4/c1-24-10-19(26)25-16(22(24)27)9-14-13-4-2-3-5-15(13)23-20(14)21(25)12-6-7-17-18(8-12)29-11-28-17/h2-8,16,21,23H,9-11H2,1H3/t16-,21-/m1/s1
IUPAC Name
(2R,8R)-2-(2H-1,3-benzodioxol-5-yl)-6-methyl-3,6,17-triazatetracyclo[8.7.0.0³,⁸.0¹¹,¹⁶]heptadeca-1(10),11,13,15-tetraene-4,7-dione
SMILES
[H][[email protected]]12CC3=C(NC4=CC=CC=C34)[[email protected]](N1C(=O)CN(C)C2=O)C1=CC2=C(OCO2)C=C1

References

Synthesis Reference

Ben-Zion Dolitzky, Dov Diller, "Preparation of tadalafil intermediates." U.S. Patent US20060276652, issued December 07, 2006.

US20060276652
General References
  1. Naeije R, Huez S: Expert opinion on available options treating pulmonary arterial hypertension. Expert Opin Pharmacother. 2007 Oct;8(14):2247-65. [PubMed:17927481]
  2. Burnett AL: Molecular pharmacotherapeutic targeting of PDE5 for preservation of penile health. J Androl. 2008 Jan-Feb;29(1):3-14. Epub 2007 Oct 17. [PubMed:17942972]
  3. Guazzi M, Samaja M: The role of PDE5-inhibitors in cardiopulmonary disorders: from basic evidence to clinical development. Curr Med Chem. 2007;14(20):2181-91. [PubMed:17691956]
Human Metabolome Database
HMDB0014958
KEGG Drug
D02008
PubChem Compound
110635
PubChem Substance
46507646
ChemSpider
99301
BindingDB
14777
RxNav
358263
ChEBI
71940
ChEMBL
CHEMBL779
ZINC
ZINC000003993855
Therapeutic Targets Database
DAP000615
PharmGKB
PA10333
PDBe Ligand
CIA
RxList
RxList Drug Page
Drugs.com
Drugs.com Drug Page
PDRhealth
PDRhealth Drug Page
Wikipedia
Tadalafil
AHFS Codes
  • 24:12.12 — Phosphodiesterase Type 5 Inhibitors
PDB Entries
1udu / 1xoz
FDA label
Download (287 KB)
MSDS
Download (73.7 KB)

Clinical Trials

Clinical Trials
PhaseStatusPurposeConditionsCount
4Active Not RecruitingTreatmentErectile Dysfunction / Premature Ejaculation / Safety Issues1
4Active Not RecruitingTreatmentLower Urinary Tract Symptoms (LUTS) / Prostatic Hyperplasia1
4CompletedNot AvailableErectile Dysfunction1
4CompletedBasic ScienceBecker's Muscular Dystrophy (BMD)1
4CompletedTreatmentBecker's Muscular Dystrophy (BMD)1
4CompletedTreatmentBenign Prostatic Hyperplasia (BPH)1
4CompletedTreatmentBMI >30 kg/m21
4CompletedTreatmentBMI >30 kg/m2 / Sexual Dysfunctions1
4CompletedTreatmentConnective Tissue Diseases / Pulmonary Arterial Hypertension (PAH) / Pulmonary Hypertension (PH) / Scleroderma Spectrum of Diseases / Sclerosis, Progressive Systemic1
4CompletedTreatmentDiabetic Cardiomyopathy / Type 2 Diabetes Mellitus1

Pharmacoeconomics

Manufacturers
  • Eli lilly co
  • Eli lilly and co
  • Eli Lilly and Company
Packagers
  • A-S Medication Solutions LLC
  • Bryant Ranch Prepack
  • Diversified Healthcare Services Inc.
  • Eli Lilly & Co.
  • Lake Erie Medical and Surgical Supply
  • Lilly Del Caribe Inc.
  • Nucare Pharmaceuticals Inc.
  • Physicians Total Care Inc.
  • Rebel Distributors Corp.
  • Redpharm Drug
  • Southwood Pharmaceuticals
  • United Therapeutics Corp.
Dosage Forms
FormRouteStrength
Tablet, film coatedOral20 mg
Tablet, film coated20 mg
Tablet, film coated5 mg
TabletOral
TabletOral10 mg
TabletOral2.5 mg
Tablet, film coatedOral
Tablet, film coatedOral10 mg/1
Tablet, film coatedOral10 mg
Tablet, film coatedOral2.5 mg/1
Tablet, film coatedOral2.5 mg
Tablet, film coatedOral20 mg/1
Tablet, film coatedOral5 mg
Tablet, film coatedOral5 mg/1
Tablet
Film, solubleOral
TabletOral5 mg
Tablet, solubleOral10 mg
Tablet, orally disintegratingOral10 mg
Tablet, coatedOral20 mg
Tablet, coatedOral5 mg
Tablet, orally disintegratingOral5 mg
Film, solubleOral20 mg
Tablet, film coated10 mg
Tablet20 mg
Tablet2.5 mg
Tablet5 mg
Tablet, coated30 mg
TabletOral10 mg/1
TabletOral2.5 mg/1
TabletOral20 mg/1
TabletOral5 mg/1
Tablet, coatedOral10 mg/1
Tablet, coatedOral2.5 mg/1
Tablet, coatedOral20 mg/1
Tablet, coatedOral5 mg/1
Tablet, coatedOral2.5 MG
Tablet, coated10 MG
Tablet, coated20 MG
Tablet, coated5 MG
Tablet, orally disintegratingOral20 mg
TabletOral20 mg
Tablet, solubleOral5 mg
Tablet, chewableOral5 mg
Tablet, coatedOral10 mg
Tablet, effervescent10 mg
Tablet, effervescent2.5 mg
Tablet, effervescent20 mg
Tablet, effervescent5 mg
Prices
Unit descriptionCostUnit
Cialis 30 5 mg tablet Box140.77USD box
Cialis 10 mg tablet20.92USD tablet
Cialis 20 mg tablet20.92USD tablet
Cialis 2.5 mg tablet4.76USD tablet
Cialis 5 mg tablet4.76USD tablet
DrugBank does not sell nor buy drugs. Pricing information is supplied for informational purposes only.
Patents
Patent NumberPediatric ExtensionApprovedExpires (estimated)Region
CA2379948No2008-03-252020-04-26Canada flag
CA2181377No2002-05-282015-01-19Canada flag
US6140329No2000-10-312016-07-11US flag
US6821975Yes2004-11-232021-05-19US flag
US6943166Yes2005-09-132020-10-26US flag
US7182958Yes2007-02-272020-10-26US flag
US5859006Yes1999-01-122018-05-21US flag
Additional Data Available
  • Filed On
    Filed On

    The date on which a patent was filed with the relevant government.

    Learn more

Properties

State
Solid
Experimental Properties
PropertyValueSource
melting point (°C)301-302 °CNot Available
water solubilityPractically insoluble in waterNot Available
logP1.7Not Available
Predicted Properties
PropertyValueSource
Water Solubility0.25 mg/mLALOGPS
logP2.36ALOGPS
logP1.64ChemAxon
logS-3.2ALOGPS
pKa (Strongest Acidic)15.17ChemAxon
pKa (Strongest Basic)-4.2ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area74.87 Å2ChemAxon
Rotatable Bond Count1ChemAxon
Refractivity104.08 m3·mol-1ChemAxon
Polarizability40.92 Å3ChemAxon
Number of Rings6ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Predicted ADMET Features
PropertyValueProbability
Human Intestinal Absorption+0.9933
Blood Brain Barrier+0.7821
Caco-2 permeable+0.5
P-glycoprotein substrateSubstrate0.6581
P-glycoprotein inhibitor INon-inhibitor0.59
P-glycoprotein inhibitor IINon-inhibitor0.775
Renal organic cation transporterNon-inhibitor0.7165
CYP450 2C9 substrateNon-substrate0.8742
CYP450 2D6 substrateNon-substrate0.9116
CYP450 3A4 substrateSubstrate0.7407
CYP450 1A2 substrateNon-inhibitor0.7447
CYP450 2C9 inhibitorInhibitor0.5566
CYP450 2D6 inhibitorNon-inhibitor0.6788
CYP450 2C19 inhibitorInhibitor0.6998
CYP450 3A4 inhibitorNon-inhibitor0.6981
CYP450 inhibitory promiscuityHigh CYP Inhibitory Promiscuity0.7235
Ames testNon AMES toxic0.6466
CarcinogenicityNon-carcinogens0.931
BiodegradationNot ready biodegradable0.8906
Rat acute toxicity2.6521 LD50, mol/kg Not applicable
hERG inhibition (predictor I)Weak inhibitor0.976
hERG inhibition (predictor II)Non-inhibitor0.8734
ADMET data is predicted using admetSAR, a free tool for evaluating chemical ADMET properties. (23092397)

Spectra

Mass Spec (NIST)
Not Available
Spectra
SpectrumSpectrum TypeSplash Key
Predicted GC-MS Spectrum - GC-MSPredicted GC-MSNot Available
Predicted MS/MS Spectrum - 10V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 10V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Negative (Annotated)Predicted LC-MS/MSNot Available
LC-MS/MS Spectrum - LC-ESI-qTof , PositiveLC-MS/MSNot Available
MS/MS Spectrum - Linear Ion Trap , negativeLC-MS/MSsplash10-03di-0090000000-c52485d22b5893fc60a2
MS/MS Spectrum - Linear Ion Trap , negativeLC-MS/MSsplash10-03di-0090000000-2f6ad2194cd2932b0761
MS/MS Spectrum - Linear Ion Trap , positiveLC-MS/MSsplash10-0i0r-0291000000-a4ae40141abccfc86710
MS/MS Spectrum - Linear Ion Trap , positiveLC-MS/MSsplash10-0j59-0290000000-86095fe2d98833db9d0b
MS/MS Spectrum - Linear Ion Trap , positiveLC-MS/MSsplash10-0uy0-0429200000-641774545afc89315134
MS/MS Spectrum - Linear Ion Trap , positiveLC-MS/MSsplash10-0uy0-0429200000-f223c860e93cceeeacd8
MS/MS Spectrum - , positiveLC-MS/MSsplash10-014i-0292000000-0563bdd5b0be8c1cfa47
MS/MS Spectrum - , positiveLC-MS/MSsplash10-02t9-2890000000-0be3708ad44a8a467cc5

Targets

Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Inhibitor
General Function
Metal ion binding
Specific Function
Plays a role in signal transduction by regulating the intracellular concentration of cyclic nucleotides. This phosphodiesterase catalyzes the specific hydrolysis of cGMP to 5'-GMP (PubMed:9714779, ...
Gene Name
PDE5A
Uniprot ID
O76074
Uniprot Name
cGMP-specific 3',5'-cyclic phosphodiesterase
Molecular Weight
99984.14 Da
References
  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [PubMed:11752352]
  2. Curran M, Keating G: Tadalafil. Drugs. 2003;63(20):2203-12; discussion 2213-4. [PubMed:14498756]
  3. Eardley I, Cartledge J: Tadalafil (Cialis) for men with erectile dysfunction. Int J Clin Pract. 2002 May;56(4):300-4. [PubMed:12074215]
  4. Montorsi F, Salonia A, Deho' F, Cestari A, Guazzoni G, Rigatti P, Stief C: Pharmacological management of erectile dysfunction. BJU Int. 2003 Mar;91(5):446-54. [PubMed:12603396]
  5. Rotella DP: Tadalafil Lilly ICOS. Curr Opin Investig Drugs. 2003 Jan;4(1):60-5. [PubMed:12625031]
  6. Roumeguere T, Sternon J, Schulman CC: [Erectile dysfunction and phosphodiesterase type 5 inhibitors]. Rev Med Brux. 2003 Jun;24(3):169-75. [PubMed:12891884]
  7. Zoraghi R, Francis SH, Corbin JD: Critical amino acids in phosphodiesterase-5 catalytic site that provide for high-affinity interaction with cyclic guanosine monophosphate and inhibitors. Biochemistry. 2007 Nov 27;46(47):13554-63. Epub 2007 Nov 3. [PubMed:17979301]
Kind
Protein
Organism
Humans
Pharmacological action
Unknown
Actions
Inhibitor
General Function
Metal ion binding
Specific Function
Plays a role in signal transduction by regulating the intracellular concentration of cyclic nucleotides cAMP and cGMP. Catalyzes the hydrolysis of both cAMP and cGMP to 5'-AMP and 5'-GMP, respectiv...
Gene Name
PDE11A
Uniprot ID
Q9HCR9
Uniprot Name
Dual 3',5'-cyclic-AMP and -GMP phosphodiesterase 11A
Molecular Weight
104750.64 Da
References
  1. Weeks JL 2nd, Corbin JD, Francis SH: Interactions between cyclic nucleotide phosphodiesterase 11 catalytic site and substrates or tadalafil and role of a critical Gln-869 hydrogen bond. J Pharmacol Exp Ther. 2009 Oct;331(1):133-41. doi: 10.1124/jpet.109.156935. Epub 2009 Jul 29. [PubMed:19641165]
  2. Weeks JL 2nd, Zoraghi R, Francis SH, Corbin JD: N-Terminal domain of phosphodiesterase-11A4 (PDE11A4) decreases affinity of the catalytic site for substrates and tadalafil, and is involved in oligomerization. Biochemistry. 2007 Sep 11;46(36):10353-64. Epub 2007 Aug 16. [PubMed:17696499]

Enzymes

Kind
Protein
Organism
Humans
Pharmacological action
Unknown
Actions
Substrate
General Function
Vitamin d3 25-hydroxylase activity
Specific Function
Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It performs a variety of oxidation react...
Gene Name
CYP3A4
Uniprot ID
P08684
Uniprot Name
Cytochrome P450 3A4
Molecular Weight
57342.67 Da
References
  1. Takahiro R, Nakamura S, Kohno H, Yoshimura N, Nakamura T, Ozawa S, Hirono K, Ichida F, Taguchi M: Contribution of CYP3A isoforms to dealkylation of PDE5 inhibitors: a comparison between sildenafil N-demethylation and tadalafil demethylenation. Biol Pharm Bull. 2015;38(1):58-65. doi: 10.1248/bpb.b14-00566. [PubMed:25744459]
  2. Tadalafil FDA label [File]
Kind
Protein
Organism
Humans
Pharmacological action
Unknown
Actions
Substrate
General Function
Oxygen binding
Specific Function
Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally un...
Gene Name
CYP3A5
Uniprot ID
P20815
Uniprot Name
Cytochrome P450 3A5
Molecular Weight
57108.065 Da
References
  1. Takahiro R, Nakamura S, Kohno H, Yoshimura N, Nakamura T, Ozawa S, Hirono K, Ichida F, Taguchi M: Contribution of CYP3A isoforms to dealkylation of PDE5 inhibitors: a comparison between sildenafil N-demethylation and tadalafil demethylenation. Biol Pharm Bull. 2015;38(1):58-65. doi: 10.1248/bpb.b14-00566. [PubMed:25744459]
  2. Flockhart Table of Drug Interactions [Link]

Drug created on June 13, 2005 07:24 / Updated on October 23, 2020 21:53

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