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Drostanolone New-And-Improved.png
Clinical data
Trade names Drolban, Masteril, Masteron, others (all as drostanolone propionate)
Other names Dromostanolone; 2α-Methyl-4,5α-dihydrotestosterone; 2α-Methyl-DHT; 2α-Methyl-5α-androstan-17β-ol-3-one
Routes of
Intramuscular injection (as drostanolone propionate)
Drug class Androgen; Anabolic steroid
Legal status
Legal status
CAS Number
  • 58-19-5 ☑Y
PubChem CID
  • 6011
  • 5789 ☒N
  • 7DR7H00HDT
  • ChEMBL1582 ☒N
CompTox Dashboard (EPA)
  • DTXSID6022971
ECHA InfoCard 100.000.334
Chemical and physical data
Formula C20H32O2
Molar mass 304.46 g/mol g·mol−1
3D model (JSmol)
  • Interactive image
 ☒N☑Y (what is this?)   (verify)

Drostanolone, or dromostanolone, is an anabolic–androgenic steroid (AAS) of the dihydrotestosterone (DHT) group which was never marketed.[1][2][3] An androgen ester prodrug of drostanolone, drostanolone propionate, was formerly used in the treatment of breast cancer in women under brand names such as Drolban, Masteril, and Masteron.[1][2][3][4] This ester has also been used non-medically for physique- or performance-enhancing purposes.[3]



Androgenic vs. anabolic activity
of androgens/anabolic steroids

Medication Ratioa
Testosterone ~1:1
Androstanolone (DHT) ~1:1
Methyltestosterone ~1:1
Methandriol ~1:1
Fluoxymesterone 1:1–1:15
Metandienone 1:1–1:8
Drostanolone 1:3–1:4
Metenolone 1:2–1:30
Oxymetholone 1:2–1:9
Oxandrolone 1:3–1:13
Stanozolol 1:1–1:30
Nandrolone 1:3–1:16
Ethylestrenol 1:2–1:19
Norethandrolone 1:1–1:20
Notes: In rodents. Footnotes: a = Ratio of androgenic to anabolic activity. Sources: See template.

Like other AAS, drostanolone is an agonist of the androgen receptor (AR).[3] It is not a substrate for 5α-reductase and is a poor substrate for 3α-hydroxysteroid dehydrogenase (3α-HSD), and therefore shows a high ratio of anabolic to androgenic activity.[3] As a DHT derivative, drostanolone is not a substrate for aromatase and hence cannot be aromatized into estrogenic metabolites.[3] While no data are available on the progestogenic activity of drostanolone, it is thought to have low or no such activity similarly to other DHT derivatives.[3] Since the drug is not 17α-alkylated, it is not known to cause hepatotoxicity.[3]


Drostanolone, also known as 2α-methyl-5α-dihydrotestosterone (2α-methyl-DHT) or as 2α-methyl-5α-androstan-17β-ol-3-one, is a synthetic androstane steroid and a derivative of DHT.[1][2][3] It is specifically DHT with a methyl group at the C2α position.[1][2][3]


Drostanolone and its ester drostanolone propionate were first described in 1959.[3][5] Drostanolone propionate was first introduced for medical use in 1961.[6]

Society and culture

Generic names

Drostanolone is the generic name of the drug and its INN, BAN, and DCF.[1][2] It has also been referred to as dromostanolone.[1][2]

Legal status

Drostanolone, along with other AAS, is a schedule III controlled substance in the United States under the Controlled Substances Act.[7]


  1. ^ a b c d e f Elks J (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 652–. ISBN 978-1-4757-2085-3.
  2. ^ a b c d e f Index Nominum 2000: International Drug Directory. Taylor & Francis. January 2000. pp. 377–. ISBN 978-3-88763-075-1.
  3. ^ a b c d e f g h i j k Llewellyn W (2011). Anabolics. Molecular Nutrition Llc. pp. 517–. ISBN 978-0-9828280-1-4.
  4. ^ Bennett MB, Helman P, Palmer P (November 1975). "Hormonal therapy of breast cancer with special reference to Masteril therapy". South African Medical Journal = Suid-Afrikaanse Tydskrif vir Geneeskunde. 49 (49): 2036–40. PMID 1242823.
  5. ^ Ringold HJ, Batres E, Halpern O, Necoechea E (1959). "Steroids. CV.12-Methyl and 2-Hydroxymethylene-androstane Derivatives". Journal of the American Chemical Society. 81 (2): 427–432. doi:10.1021/ja01511a040. ISSN 0002-7863.
  6. ^ William Andrew Publishing (22 October 2013). Pharmaceutical Manufacturing Encyclopedia, 3rd Edition. Elsevier. pp. 1402–. ISBN 978-0-8155-1856-3.
  7. ^ Karch SB (21 December 2006). Drug Abuse Handbook, Second Edition. CRC Press. pp. 30–. ISBN 978-1-4200-0346-8.

External links

  • Masteron (drostanolone propionate) - William Llewellyn's Anabolic.org
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