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Clinical data
Trade namesSediel
Other namesMetanopirone
AHFS/Drugs.comInternational Drug Names
Routes of
ATC code
  • none
Legal status
Legal status
  • In general: ℞ (Prescription only)
Pharmacokinetic data
Elimination half-lifeTandospirone: 2–3 hours
1-PP: 3–5 hours
ExcretionUrine (70%; 0.1% as unchanged drug)
  • (1R,2R,6S,7S)-4-{4-[4-(pyrimidin-2-yl)piperazin-1-yl]butyl}-4-azatricyclo[,6]decane-3,5-dione
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.210.461 Edit this at Wikidata
Chemical and physical data
Molar mass383.496 g·mol−1
3D model (JSmol)
  • O=C1N(C(=O)[C@H]3[C@@H]1[C@@H]2CC[C@H]3C2)CCCCN5CCN(c4ncccn4)CC5
  • InChI=1S/C21H29N5O2/c27-19-17-15-4-5-16(14-15)18(17)20(28)26(19)9-2-1-8-24-10-12-25(13-11-24)21-22-6-3-7-23-21/h3,6-7,15-18H,1-2,4-5,8-14H2/t15-,16+,17+,18- checkY
 ☒NcheckY (what is this?)  (verify)

Tandospirone (brand name Sediel) is an anxiolytic and antidepressant drug used in China and Japan, where it is marketed by Dainippon Sumitomo Pharma. It is a member of the azapirone class of drugs and is closely related to other azapirones like buspirone and gepirone.

Medical uses

Anxiety and depression

Tandospirone is most commonly used as a treatment for anxiety and depressive disorders, such as generalised anxiety disorder and dysthymia respectively.[1] For both indications it usually takes a couple of weeks for therapeutic effects to begin to be seen,[1] although at higher doses more rapid anxiolytic responses have been seen.[2] It has also been used successfully as a treatment for bruxism.[3]

Augmentation for depression

Tandospirone can be used as an effective augmentation,[clarification needed] especially when coupled with fluoxetine or clomipramine.[4]

Other uses

Tandospirone has been tried successfully as an adjunctive treatment for cognitive symptoms[clarification needed] in schizophrenic individuals.[5]

Side effects

Common adverse effects include:[1]

  • Dizziness
  • Drowsiness
  • Insomnia
  • Headache
  • Gastrointestinal disorders
  • Dry mouth
  • Negative influence on explicit memory function[1]

Adverse effects with unknown frequency include:[1]

It is not believed to be addictive but is known to produce mild withdrawal effects (e.g., anorexia) after abrupt discontinuation.[1]



Tandospirone acts as a potent and selective 5-HT1A receptor partial agonist, with a Ki affinity value of 27 ± 5 nM[6] and approximately 55 to 85% intrinsic activity.[7][8] It has relatively weak affinity for the 5-HT2A (1,300 ± 200), 5-HT2C (2,600 ± 60), α1-adrenergic (1,600 ± 80), α2-adrenergic (1,900 ± 400), D1 (41,000 ± 10,000), and D2 (1,700 ± 300) receptors, and is essentially inactive at the 5-HT1B, 5-HT1D, β-adrenergic, and muscarinic acetylcholine receptors, serotonin transporter, and benzodiazepine allosteric site of the GABAA receptor (all of which are > 100,000).[6] There is evidence of tandospirone having low but significant antagonistic activity at the α2-adrenergic receptor through its active metabolite 1-(2-pyrimidinyl)piperazine (1-PP).[9][10]

Society and culture


Tandospirone has also been known as metanopirone.


  1. ^ a b c d e f Barradell LB, Fitton A (February 1996). "Tandospirone". CNS Drugs. 5 (2): 147–153. doi:10.2165/00023210-199605020-00006.
  2. ^ Nishitsuji K, To H, Murakami Y, Kodama K, Kobayashi D, Yamada T, et al. (2004). "Tandospirone in the treatment of generalised anxiety disorder and mixed anxiety-depression : results of a comparatively high dosage trial". Clinical Drug Investigation. 24 (2): 121–126. doi:10.2165/00044011-200424020-00007. PMID 17516698. S2CID 38339009.
  3. ^ Tandospirone. Martindale: The Complete Drug Reference. The Royal Pharmaceutical Society of Great Britain. 23 September 2011. Retrieved 14 November 2013.
  4. ^ Huang X, Yang J, Yang S, Cao S, Qin D, Zhou Y, et al. (November 2017). "Role of tandospirone, a 5-HT1A receptor partial agonist, in the treatment of central nervous system disorders and the underlying mechanisms". Oncotarget. Impact Journals, LLC. 8 (60): 102705–102720. doi:10.18632/oncotarget.22170. PMC 5731992. PMID 29254282.
  5. ^ Sumiyoshi T, Matsui M, Nohara S, Yamashita I, Kurachi M, Sumiyoshi C, et al. (October 2001). "Enhancement of cognitive performance in schizophrenia by addition of tandospirone to neuroleptic treatment". The American Journal of Psychiatry. 158 (10): 1722–1725. doi:10.1176/appi.ajp.158.10.1722. PMID 11579010.
  6. ^ a b Hamik A, Oksenberg D, Fischette C, Peroutka SJ (July 1990). "Analysis of tandospirone (SM-3997) interactions with neurotransmitter receptor binding sites". Biological Psychiatry. 28 (2): 99–109. doi:10.1016/0006-3223(90)90627-E. PMID 1974152. S2CID 25608914.
  7. ^ Tanaka H, Tatsuno T, Shimizu H, Hirose A, Kumasaka Y, Nakamura M (December 1995). "Effects of tandospirone on second messenger systems and neurotransmitter release in the rat brain". General Pharmacology. 26 (8): 1765–1772. doi:10.1016/0306-3623(95)00077-1. PMID 8745167.
  8. ^ Yabuuchi K, Tagashira R, Ohno Y (2004). "Effects of tandospirone, a novel anxiolytic agent, on human 5-HT1A receptors expressed in Chinese hamster ovary cells (CHO cells)". Biogenic Amines. 18 (3): 319–328. doi:10.1163/1569391041501933.
  9. ^ Blier P, Curet O, Chaput Y, de Montigny C (July 1991). "Tandospirone and its metabolite, 1-(2-pyrimidinyl)-piperazine--II. Effects of acute administration of 1-PP and long-term administration of tandospirone on noradrenergic neurotransmission". Neuropharmacology. 30 (7): 691–701. doi:10.1016/0028-3908(91)90176-C. PMID 1681447. S2CID 44297577.
  10. ^ Miller LG, Thompson ML, Byrnes JJ, Greenblatt DJ, Shemer A (October 1992). "Kinetics, brain uptake, and receptor binding of tandospirone and its metabolite 1-(2-pyrimidinyl)-piperazine". Journal of Clinical Psychopharmacology. 12 (5): 341–345. doi:10.1097/00004714-199210000-00009. PMID 1362206. S2CID 22449352.