Clinical data
Synonyms Δ1-Testosterone; 1-Dehydrotestosterone; RU-18761; Androsta-1,4-dien-17β-ol-3-one
AHFS/ International Drug Names
Routes of
Intramuscular injection
Drug class Androgen; Anabolic steroid
ATC code
  • None
Legal status
Legal status
Pharmacokinetic data
Elimination half-life Intramuscular: 14 days (as boldenone undecylenate)[1]
CAS Number
PubChem CID
ECHA InfoCard 100.011.533
Chemical and physical data
Formula C19H26O2
Molar mass 286.409 g/mol
3D model (JSmol)
Melting point 165 °C (329 °F)
 NY (what is this?)  (verify)

Boldenone (developmental code name RU-18761), also known as Δ1-testosterone, is a naturally occurring anabolic–androgenic steroid (AAS) and the 1(2)-dehydrogenated analogue of testosterone.[2][3][4][5][6] Boldenone itself has never been marketed; as a pharmaceutical drug, it is used as boldenone undecylenate, the undecylenate ester.[2][3][6]

Side effects



Like other AAS, boldenone is an agonist of the androgen receptor (AR).[6] The activity of boldenone is mainly anabolic, with a low androgenic potency. Boldenone will increase nitrogen retention, protein synthesis, increases appetite and stimulates the release of erythropoietin in the kidneys.[7] Boldenone was synthesized in an attempt to create a long-acting injectable metandienone, for androgen deficiency disorders. Boldenone acts similar to metandienone with fewer adverse androgenic effects. Although commonly compared to nandrolone, boldenone lacks progesterone receptor interaction and associated progestogenic side effects.


Boldenone, also known as Δ1-testosterone, 1-dehydrotestosterone, or androsta-1,4-dien-17β-ol-3-one, is a naturally occurring androstane steroid and a derivative of testosterone.[2][3][6] It is specifically testosterone with a double bond between the C1 and C2 positions.[2][3][6] A related compound is quinbolone, the 17-cyclopentenyl enol ether of boldenone.[2][3]


Boldenone occurs naturally in the scent gland of Ilybius fenestratus, a species of aquatic beetle.[2]


Ciba reportedly patented boldenone in 1949.[6] It subsequently developed several experimental esters of the drug in the 1950s and 1960s.[6] One of these was boldenone undecylenate, which was introduced for clinical use under the brand name Parenabol and saw some use in the late 1960s and early 1970s.[6] However, it was discontinued before the end of the 1970s.[6] Subsequently, boldenone undecylenate was introduced by Squibb under the brand name Equipose for veterinary use, most commonly in horses.[6]

Society and culture

Generic names

Boldenone is the generic name of the drug and its INN and BAN.[2][3][4][5]

Brand names

Boldenone is marketed as veterinary drug as boldenone undecylenate (a derivative of boldenone) under the following brand names: Boldebal H, Equipoise, and Sybolin.[5] It is marketed as a veterinary combination drug with methandriol under the brand name Drive.[5]

Doping in sports

There are many known cases of doping in sports with boldenone undecylenate by professional athletes.


  1. Pedro Ruiz; Eric C. Strain (2011). Lowinson and Ruiz's Substance Abuse: A Comprehensive Textbook. Lippincott Williams & Wilkins. pp. 358–. ISBN 978-1-60547-277-5.
  2. 1 2 3 4 5 6 7 J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 640–. ISBN 978-1-4757-2085-3.
  3. 1 2 3 4 5 6 Index Nominum 2000: International Drug Directory. Taylor & Francis. 2000. pp. 131–. ISBN 978-3-88763-075-1.
  4. 1 2 I.K. Morton; Judith M. Hall (6 December 2012). Concise Dictionary of Pharmacological Agents: Properties and Synonyms. Springer Science & Business Media. pp. 52–. ISBN 978-94-011-4439-1.
  5. 1 2 3 4 "Boldenone international brand names". Retrieved 28 April 2017.
  6. 1 2 3 4 5 6 7 8 9 10 William Llewellyn (2011). Anabolics. Molecular Nutrition Llc. pp. 483–490. ISBN 978-0-9828280-1-4.
  7. Forbes GB (1985) The effect of anabolic steroids on lean body mass the dose response curve. Metab Clin Exp 34(6) 571–573
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