Clinical data
ATC code None
Legal status
Legal status
Synonyms Allylpental, Cyclopental, 5-Allyl-5-Δ2-Cyclopentenyl Barbituric Acid
CAS Number 76-68-6
302-34-1 (sodium salt)
PubChem (CID) 6454
ChemSpider 6212 YesY
ECHA InfoCard 100.000.891
Chemical and physical data
Formula C12H14N2O3
Molar mass 234.251 g/mol
3D model (Jmol) Interactive image

Cyclopentobarbital sodium (Cyclopal, Dormisan) is a barbiturate derivative invented in the 1940s.[1] It has sedative and anticonvulsant properties, and was used primarily as an anaesthetic in veterinary medicine.[2] Cyclopal is considered similar in effects to phenobarbital but lasts almost three times as long, and is considered a long-acting barbiturate with a fairly slow onset of action.

See also


  1. Martin, J. R.; Godel, T.; Hunkeler, W.; Jenck, F.; Moreau, J.-L.; Sleight, A. J.; Widmer, U. (2000). "Psychopharmacological Agents". doi:10.1002/0471238961.1619250313011820.a01.
  2. Vander Brook MJ, Cartland GF. A Pharmacologic Study of 5-Allyl-5-Cyclopentenyl Barbituric Acid (Cyclopal). Journal of Pharmacology And Experimental Therapeutics, 1944, 80(2): 119-125

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