Tandospirone

Tandospirone

Systematic (IUPAC) name
(1R,2R,6S,7S)-4-{4-[4-(pyrimidin-2-yl)piperazin-1-yl]butyl}-4-azatricyclo[5.2.1.02,6]decane-3,5-dione
Clinical data
AHFS/Drugs.com	International Drug Names
Pregnancy cat.	?
Legal status	℞ Prescription only
Routes	Oral
Pharmacokinetic data
Half-life	1.2–1.4 hours
Identifiers
CAS number	112457-95-1 N
ATC code	None
PubChem	CID 91273
IUPHAR ligand	55
ChemSpider	82421 Y
UNII	190230I669 Y
ChEMBL	CHEMBL274047 Y
Chemical data
Formula	C21H29N5O2
Mol. mass	383.487 g/mol
SMILES	eMolecules & PubChem
InChI 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- Y Key:CEIJFEGBUDEYSX-FZDBZEDMSA-N Y
N (what is this?)  (verify)

Tandospirone (Sediel), also known as metanopirone, is an anxiolytic and antidepressant used in China and Japan, where it is marketed by Dainippon Sumitomo Pharma. It is a member of the azapirone and piperazine chemical classes and is closely related to other agents like buspirone and gepirone.

Pharmacology

Tandospirone acts as a potent and selective 5-HT_1A receptor partial agonist, with a K_i affinity value of 27 ± 5 nM and approximately 55-85% intrinsic activity. It has weak and clinically negligible affinity for the 5-HT_2A (1,300 ± 200), 5-HT_2C (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-HT_1B, 5-HT_1D, β-adrenergic, and muscarinic acetylcholine receptors, serotonin transporter (SERT), and benzodiazepine (BDZ) allosteric site of the GABA_A receptor (all of which are > 100,000). 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), however.

Dosage

Tandospirone is typically used at a dose of 30 mg/daily taken in divided doses of 10 mg three times per day due to its short half-life. Though originally considered a relatively weak anxiolytic agent, a clinical study found that doubling the dose to 60 mg/daily resulted in a "remarkable anxiolytic effect with an early onset of action, and without significant adverse effects", as well as "excellent anxiolytic efficacy that is comparable to that of the benzodiazepines".

Side effects

Side effects of tandospirone and other 5-HT_1A partial agonists are relatively mild and may include nausea, diarrhea, headache, dizziness, and restlessness.

Chemistry

Yevich, Joseph P.; New, James S.; Smith, David W.; Lobeck, Walter G.; Catt, John D.; Minielli, Joseph L.; Eison, Michael S.; Taylor, Duncan P. et al (1986). "Synthesis and biological evaluation of 1-(1,2-benzisothiazol-3-yl)- and (1,2-benzisoxazol-3-yl)piperazine derivatives as potential antipsychotic agents". Journal of Medicinal Chemistry 29 (3): 359–69. doi:10.1021/jm00153a010. PMID 2869146. 

See also

• Buspirone
• Gepirone
• Eptapirone