Accession NumberDB01485
TypeSmall Molecule
GroupsExperimental, Illicit

4-Hydroxytestosterone is testosterone substituted with a hydroxy group on the fourth carbon atom. It is an anabolic steroid with no therapeutic indications, which is prohibited from use in sports by the World Anti-Doping Agency. [1]

Formestane (Lentaron) acts as a prohormone of 4-Hydroxytestosterone, as 4-Hydroxytestosterone is one of the many byproducts of formestane metabolism. It is specifically the 17-hydroxylated analog to formestane. [1] Like formestane, 4-hydroxytesterone has been patented for use in decreasing estrogen production in the body, but no such indication currently exists. 4-Hydroxytestosterone was first patented in 1955 by G.D Searle & Company.

External IDs Not Available
Product Ingredients Not Available
Approved Prescription ProductsNot Available
Approved Generic Prescription ProductsNot Available
Approved Over the Counter ProductsNot Available
Unapproved/Other Products Not Available
International Brands
TestobolTMNot Available
Brand mixturesNot Available
CategoriesNot Available
CAS number2141-17-5
WeightAverage: 304.43
Monoisotopic: 304.203844762
Chemical FormulaC19H28O3
C[C@]12CC[[email protected]]3[C@@H](CCC4=C(O)C(=O)CC[C@]34C)[C@@H]1CC[C@@H]2O
IndicationNot Available
Structured Indications Not Available

Aanabolic steroids have a similar effect to testosterone in the body. Effects include an increase in protein production within cells, (ie. skeletal muscle cells) and well as the development and maintenance of masculine characteristics.

Mechanism of action

4-hydroxytestosterone is a fat soluble compound which can cross the lipid bilayers of cell membranes to enter the cytoplasm of cells. In the cytoplasm, 4-hydroxytestosterone can bind to an androgen receptor, which then gets transported to the nucleus of the cell to alter protein transcription and translation.

Ananolic steroids are believed to increase muscle mass by increasing the production of proteins, as well as by reducing the effects of the stress hormone cortisol, which is known to promote muscle breakdown. It is postulated that other steroid hormones (glucocorticoids) may also be inhibited by anabolic steroids in order to prevent muscle catabolism. [wiki]

Related Articles
AbsorptionNot Available
Volume of distributionNot Available
Protein bindingNot Available


Route of elimination

Renal elimination following hepatic metabolism.

Half lifeNot Available

Clearance is via the urine. Excretion studies were performed using 200mg of 4-hydroxytestosterone administered to healthy male volunteers. Urine samples were then analyzed for metabolic products using conventional gas chromatography-mass spectrometry approaches.

One metabolite, 3-beta,4-alpha-dihydroxy-5alpha-androstan-17-one was identified as a long term metabolite which can be detected for 90 hours. Longer detection times are possible with the use of alternative monitoring technique in sports drug testing.


Excessive doses of anabolic steroids can induce harmful changes in cholesterol, acne, hypertension, liver damage, and damage to the heart. Hormonal imbalances caused by the use of anabolic steriods may result in gynecomastia and testicular atrophy.

Anabolic steroids are known to increase harmful LDL, while decreasing beneficial HDL cholesterol. Their ability to stimulate sebaceous glands may increase acne. Additionally, the elevation in blood pressure caused by anabolic steroids, is particularly pronounced and harmful in those with pre-existing hypertension.

Affected organismsNot Available
PathwaysNot Available
Pharmacogenomic Effects/ADRs Not Available
Drug Interactions Not Available
Food InteractionsNot Available
Synthesis Reference

Kohler, Maxie, et al. "Metabolism of 4-hydroxyandrostenedione and 4-hydroxytestosterone: Mass spectrometric identification of urinary metabolites." Steroids 72.3 (2007): 278-286.

General References
  1. Kohler M, Parr MK, Opfermann G, Thevis M, Schlorer N, Marner FJ, Schanzer W: Metabolism of 4-hydroxyandrostenedione and 4-hydroxytestosterone: Mass spectrometric identification of urinary metabolites. Steroids. 2007 Mar;72(3):278-86. Epub 2007 Jan 17. [PubMed:17207827 ]
External Links
ATC CodesNot Available
AHFS CodesNot Available
PDB EntriesNot Available
FDA labelNot Available
MSDSNot Available
Clinical Trials
Clinical Trials Not Available
ManufacturersNot Available
PackagersNot Available
Dosage formsNot Available
PricesNot Available
PatentsNot Available
Experimental PropertiesNot Available
Predicted Properties
Water Solubility0.068 mg/mLALOGPS
pKa (Strongest Acidic)9.28ChemAxon
pKa (Strongest Basic)-0.88ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area57.53 Å2ChemAxon
Rotatable Bond Count0ChemAxon
Refractivity86.4 m3·mol-1ChemAxon
Polarizability34.88 Å3ChemAxon
Number of Rings4ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Predicted ADMET featuresNot Available
Mass Spec (NIST)Not Available
Spectrum TypeDescriptionSplash Key
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, NegativeNot Available
DescriptionThis compound belongs to the class of organic compounds known as androgens and derivatives. These are 3-hydroxylated C19 steroid hormones. They are known to favor the development of masculine characteristics. They also show profound effects on scalp and body hair in humans.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassSteroids and steroid derivatives
Sub ClassAndrostane steroids
Direct ParentAndrogens and derivatives
Alternative Parents3-oxo delta-4-steroids / 17-hydroxysteroids / Delta-4-steroids / Cyclohexenones / Secondary alcohols / Cyclic alcohols and derivatives / Enols / Organic oxides / Hydrocarbon derivatives
SubstituentsAndrogen-skeleton / 3-oxo-delta-4-steroid / 3-oxosteroid / 4-hydroxysteroid / Hydroxysteroid / Oxosteroid / 17-hydroxysteroid / Delta-4-steroid / Cyclohexenone / Cyclic alcohol
Molecular FrameworkAliphatic homopolycyclic compounds
External DescriptorsC19 steroids (androgens) and derivatives (LMST02020102 )
Drug created on July 31, 2007 07:09 / Updated on August 02, 2017 16:33