Clinical data
Routes of
ATC code
  • none
Legal status
Legal status
  • In general: ℞ (Prescription only)
  • 2-(4-chlorophenyl)-4-methyl-pentane-2,4-diol
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.036.150 Edit this at Wikidata
Chemical and physical data
Molar mass228.72 g·mol−1

Fenpentadiol (INN) (brand names Tredum, Trefenum; developmental code name Rd-292), also known as phenpentanediol, is a drug described as a tranquilizer and antidepressant that was formerly marketed in Europe.[1][2] It also has stimulant, sedative, and anxiolytic effects, with the latter two occurring only at higher doses.[3][4]

The following literature incidence of the fenpentadiol has been found and quoted:

In three articles the properties of a new psychotropic agent from the series of araliphatic alcohols — phenpentanediol (CXV) — were described (477-479). It is not easy to place this substance anywhere in the pharmacodynamic system of psychotropic agents: on the one hand it potentiates the barbiturate narcosis, on the other it increases motility and exploratory activity in mice and potentiates the effects of amphetamine.

— Farmaco. Edizione Scientifica. 1974. p. 90.


  1. ^ J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 258–. ISBN 978-1-4757-2085-3.
  2. ^ O'Neil, Maryadele J. (2001). The Merck index: an encyclopedia of chemicals, drugs, and biologicals. Rahway, NJ: Merck Research Laboratories. ISBN 0-911910-13-1.
  3. ^ Ginet J, Levy JC, Rolland D (January 1971). "[Psychotropic activity under the influence of fenpentadiol]". Arzneimittel-Forschung (in German). 21 (1): 1–8. PMID 4396676.
  4. ^ Heinzelman, Richard Voorhees (1972). Cornelius K. Cain (ed.). Annual Reports in Medicinal Chemistry Volume 7. Academic Press. p. 11. ISBN 0-12-040507-5.