|AHFS/Drugs.com||International Drug Names|
|Elimination half-life||2–3 hours (3–5 hours for metabolite 1-PP)|
|Excretion||Urine (70%; 0.1% as unchanged drug)|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||383.487 g/mol g·mol−1|
|3D model (JSmol)|
|(what is this?)|
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.
Anxiety and depression
Tandospirone is most commonly used as a treatment for anxiety and depressive disorders, such as generalised anxiety disorder and dysthymia respectively. For both indications it usually takes a couple of weeks for therapeutic effects to begin to be seen, although at higher doses more rapid anxiolytic responses have been seen. It has also been used successfully as a treatment for bruxism.
Tandospirone has also been tried, successfully, as an adjunctive treatment for cognitive symptoms in schizophrenic individuals.
Common adverse effects include:
- Gastrointestinal disorders
- Dry mouth
- Negative influence on explicit memory function 
Adverse effects with unknown frequency include:
Tandospirone acts as a potent and selective 5-HT1A receptor partial agonist, with a Ki affinity value of 27 ± 5 nM and approximately 55 to 85% intrinsic activity. It has weak and clinically negligible 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). 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.
In February 2018, a study was conducted by researchers at the Queensland University of Technology and published in the journal Scientific Reports. Researchers found that tandospirone helped reverse brain deficits caused by chronic alcohol exposure in mice. The study was the first of its kind and brought interest in the drug for possible treatment of alcohol withdrawal symptoms.
Society and culture
Tandospirone has also been known as metanopirone.
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- Belmer A, Patkar OL, Lanoue V, Bartlett SE (February 2018). "5-HT1A receptor-dependent modulation of emotional and neurogenic deficits elicited by prolonged consumption of alcohol". Scientific Reports. 8 (1): 2099. Bibcode:2018NatSR...8.2099B. doi:10.1038/s41598-018-20504-z. PMC 5794771. PMID 29391482.
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