Danazol

Danazol, sold as Danocrine and other brand names, is a medication used in the treatment of endometriosis, fibrocystic breast disease, hereditary angioedema and other conditions. It is taken by mouth.

Danazol
Clinical data
Trade namesDanatrol, Danocrine, Danol, Danoval, others
Other namesWIN-17757; 2,3-Isoxazolethisterone; 2,3-Isoxazol-17α-ethynyltestosterone; 17α-Ethynyl-17β-hydroxyandrost-4-en-[2,3-d]isoxazole
AHFS/Drugs.comMonograph
MedlinePlusa682599
Pregnancy
category
  • AU: D
Routes of
administration		By mouth
Drug classAndrogen; Anabolic steroid; Progestogen; Progestin; Antigonadotropin; Steroidogenesis inhibitor; Antiestrogen
ATC code
Legal status
Legal status
  • AU: S4 (Prescription only)
  • CA: ℞-only
  • UK: POM (Prescription only)
  • US: WARNINGRx-only
Pharmacokinetic data
BioavailabilitySaturable with dosage, higher with food intake
Protein bindingTo albumin, SHBGTooltip sex hormone-binding globulin, CBGTooltip corticosteroid-binding globulin
MetabolismLiver (CYP3A4)
Metabolites• 2-OHM-Ethisterone
• Ethisterone
Elimination half-lifeAcute: 3–10 hours
Chronic: 24–26 hours
ExcretionUrine, feces
Identifiers
  • (1S,2R,13R,14S,17R,18S)-17-ethynyl-2,18-dimethyl-7-oxa-6-azapentacyclo[11.7.0.02,10.04,8.014,18]icosa-4(8),5,9-trien-17-ol
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.037.503
Chemical and physical data
FormulaC22H27NO2
Molar mass337.463 g·mol−1
3D model (JSmol)
SMILES
  • C#C[C@]1(O)CC[C@H]2[C@@H]3CCC4=Cc5oncc5C[C@]4(C)[C@H]3CC[C@@]21C
  • InChI=1S/C22H27NO2/c1-4-22(24)10-8-18-16-6-5-15-11-19-14(13-23-25-19)12-20(15,2)17(16)7-9-21(18,22)3/h1,11,13,16-18,24H,5-10,12H2,2-3H3/t16-,17+,18+,20+,21+,22+/m1/s1 Y
  • Key:POZRVZJJTULAOH-LHZXLZLDSA-N Y
  (verify)

The use of danazol is limited by masculinizing side effects such as acne, excessive hair growth, and voice deepening. Danazol has a complex mechanism of action, and is characterized as a weak androgen and anabolic steroid, a weak progestogen, a weak antigonadotropin, a weak steroidogenesis inhibitor, and a functional antiestrogen.

Danazol was discovered in 1963 and was introduced for medical use in 1971. Due to their improved side-effect profiles, particularly their lack of masculinizing side effects, danazol has largely been replaced by gonadotropin-releasing hormone analogues (GnRH analogues) in the treatment of endometriosis.

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