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Record Information
Creation Date2012-09-06 15:16:52 UTC
Update Date2014-09-23 05:27:30 UTC
Secondary Accession NumbersNone
Metabolite Identification
Common NameHydroxychloroquine
DescriptionHydroxychloroquine is only found in individuals that have used or taken this drug. It is a chemotherapeutic agent that acts against erythrocytic forms of malarial parasites.Although the exact mechanism of action is unknown, it may be based on ability of hydroxychloroquine to bind to and alter DNA. Hydroxychloroquine has also has been found to be taken up into the acidic food vacuoles of the parasite in the erythrocyte. This increases the pH of the acid vesicles, interfering with vesicle functions and possibly inhibiting phospholipid metabolism. In suppressive treatment, hydroxychloroquine inhibits the erythrocytic stage of development of plasmodia. In acute attacks of malaria, it interrupts erythrocytic schizogony of the parasite. Its ability to concentrate in parasitized erythrocytes may account for their selective toxicity against the erythrocytic stages of plasmodial infection. As an antirheumatic, hydroxychloroquine is thought to act as a mild immunosuppressant, inhibiting the production of rheumatoid factor and acute phase reactants. It also accumulates in white blood cells, stabilizing lysosomal membranes and inhibiting the activity of many enzymes, including collagenase and the proteases that cause cartilage breakdown.
  1. HCQ
Chemical FormulaC18H26ClN3O
Average Molecular Weight335.872
Monoisotopic Molecular Weight335.176440176
IUPAC Name2-({4-[(7-chloroquinolin-4-yl)amino]pentyl}(ethyl)amino)ethan-1-ol
Traditional Namehydroxychloroquine
CAS Registry Number118-42-3
InChI Identifier
Chemical Taxonomy
DescriptionThis compound belongs to the class of organic compounds known as aminoquinolines and derivatives. These are organic compounds containing an amino group attached to a quinoline ring system.
KingdomOrganic compounds
Super ClassOrganoheterocyclic compounds
ClassQuinolines and derivatives
Sub ClassAminoquinolines and derivatives
Direct ParentAminoquinolines and derivatives
Alternative Parents
  • Chloroquinoline
  • Aminoquinoline
  • Secondary aliphatic/aromatic amine
  • Chlorobenzene
  • Aminopyridine
  • Benzenoid
  • Pyridine
  • Aryl halide
  • Aryl chloride
  • Heteroaromatic compound
  • Tertiary aliphatic amine
  • Tertiary amine
  • 1,2-aminoalcohol
  • Azacycle
  • Secondary amine
  • Alkanolamine
  • Hydrocarbon derivative
  • Primary alcohol
  • Organooxygen compound
  • Organonitrogen compound
  • Organochloride
  • Organohalogen compound
  • Amine
  • Alcohol
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External DescriptorsNot Available
StatusExpected but not Quantified
  • Drug
  • Antimalarials
  • Antiprotozoal Agents
  • Antirheumatic Agents
  • Dermatologic Agents
  • Enzyme Inhibitors
  • Pharmaceutical
Cellular locations
  • Cytoplasm
  • Membrane
Physical Properties
Experimental Properties
Melting Point90 °CNot Available
Boiling PointNot AvailableNot Available
Water Solubility2.61e-02 g/LNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility0.026 mg/mLALOGPS
pKa (Strongest Acidic)15.59ChemAxon
pKa (Strongest Basic)9.76ChemAxon
Physiological Charge2ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area48.39 Å2ChemAxon
Rotatable Bond Count9ChemAxon
Refractivity97.97 m3·mol-1ChemAxon
Polarizability38.3 Å3ChemAxon
Number of Rings2ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectrum TypeDescriptionSplash Key
MSMass Spectrum (Electron Ionization)splash10-ezt9000000-7c193125680c0c9e276fView in MoNA
Biological Properties
Cellular Locations
  • Cytoplasm
  • Membrane
Biofluid Locations
  • Blood
  • Urine
Tissue LocationNot Available
PathwaysNot Available
Normal Concentrations
BloodExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableTaking drug identified by DrugBank entry DB01611
  • Not Applicable
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableTaking drug identified by DrugBank entry DB01611
  • Not Applicable
Abnormal Concentrations
Not Available
Predicted Concentrations
BiofluidValueOriginal ageOriginal sexOriginal conditionComments
Blood0-3 uMAdult (>18 years old)BothNormalPredicted based on drug qualities
Blood0-1 umol/mmol creatinineAdult (>18 years old)BothNormalPredicted based on drug qualities
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDDB01611
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDNot Available
KNApSAcK IDNot Available
Chemspider ID3526
KEGG Compound IDC07043
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkHydroxychloroquine
NuGOwiki LinkHMDB15549
Metagene LinkHMDB15549
METLIN IDNot Available
PubChem Compound3652
PDB IDNot Available
ChEBI ID529737
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General ReferencesNot Available


General function:
Involved in monooxygenase activity
Specific function:
Responsible for the metabolism of many drugs and environmental chemicals that it oxidizes. It is involved in the metabolism of drugs such as antiarrhythmics, adrenoceptor antagonists, and tricyclic antidepressants.
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  1. Preissner S, Kroll K, Dunkel M, Senger C, Goldsobel G, Kuzman D, Guenther S, Winnenburg R, Schroeder M, Preissner R: SuperCYP: a comprehensive database on Cytochrome P450 enzymes including a tool for analysis of CYP-drug interactions. Nucleic Acids Res. 2010 Jan;38(Database issue):D237-43. Epub 2009 Nov 24. [19934256 ]
  2. Somer M, Kallio J, Pesonen U, Pyykko K, Huupponen R, Scheinin M: Influence of hydroxychloroquine on the bioavailability of oral metoprolol. Br J Clin Pharmacol. 2000 Jun;49(6):549-54. [10848718 ]
General function:
Involved in protein binding
Specific function:
Key component of innate and adaptive immunity. TLRs (Toll-like receptors) control host immune response against pathogens through recognition of molecular patterns specific of microorganisms. TLR9 is a nucleotide-sensing TLR which is activated by unmethylated cytidine-phosphate-guanosine (CpG) dinucleotides. Acts via MYD88 and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response
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  1. Sun S, Rao NL, Venable J, Thurmond R, Karlsson L: TLR7/9 antagonists as therapeutics for immune-mediated inflammatory disorders. Inflamm Allergy Drug Targets. 2007 Dec;6(4):223-35. [18220957 ]
  2. Trevani AS, Chorny A, Salamone G, Vermeulen M, Gamberale R, Schettini J, Raiden S, Geffner J: Bacterial DNA activates human neutrophils by a CpG-independent pathway. Eur J Immunol. 2003 Nov;33(11):3164-74. [14579285 ]