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IUPAC name
Other names
Eltanolone; 5β-Pregnan-3α-ol-20-one; 3α-Hydroxy-5β-pregnan-20-one; 3α-Hydroxy-5β-tetrahydroprogesterone
3D model (JSmol)
ECHA InfoCard 100.162.192
Molar mass 318.50 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Pregnanolone, also known as eltanolone (INN), as well as 3α,5β-tetrahydroprogesterone (3α,5β-THP) or 3α-hydroxy-5β-pregnan-20-one, is an endogenous neurosteroid that is biosynthesized from progesterone.[1] It is a positive allosteric modulator of the GABAA receptor,[1] as well as a negative allosteric modulator of the glycine receptor,[2] and is known to have sedative, anxiolytic, anesthetic, and anticonvulsant effects.[1][2][3] It was investigated for clinical use as a general anesthetic, but produced unwanted side effects such as convulsions on occasion, and for that reason was never marketed.[2][4]

See also[edit]


  1. ^ a b c Reddy DS (2003). "Pharmacology of endogenous neuroactive steroids". Crit Rev Neurobiol. 15 (3-4): 197–234. PMID 15248811. doi:10.1615/critrevneurobiol.v15.i34.20. 
  2. ^ a b c Jürgen Schüttler; Helmut Schwilden (8 January 2008). Modern Anesthetics. Springer Science & Business Media. pp. 278–. ISBN 978-3-540-74806-9. 
  3. ^ Carl P, Høgskilde S, Lang-Jensen T, et al. (October 1994). "Pharmacokinetics and pharmacodynamics of eltanolone (pregnanolone), a new steroid intravenous anaesthetic, in humans". Acta Anaesthesiol Scand. 38 (7): 734–41. PMID 7839787. doi:10.1111/j.1399-6576.1994.tb03987.x. 
  4. ^ Norman Calvey; Norton Williams (21 January 2009). Principles and Practice of Pharmacology for Anaesthetists. John Wiley & Sons. pp. 110–. ISBN 978-1-4051-9484-6.