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CAS Number
PubChem CID
Chemical and physical data
Molar mass487.354 g/mol g·mol−1
3D model (JSmol)
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SB-258585 is a drug which is used in scientific research. It acts as a potent, selective and orally active 5-HT6 receptor antagonist, with a Ki of 8.9nM.[1] It is used in its 125I radiolabelled form to map the distribution of 5-HT6 receptors in the brain.[2][3]

SB-258585 and other 5-HT6 antagonists show nootropic effects in animal studies,[4][5] as well as antidepressant and anxiolytic effects,[6] and have been proposed as potential novel treatments for cognitive disorders such as schizophrenia and Alzheimer's disease.


  1. ^ Hirst, WD; Minton, JA; Bromidge, SM; Moss, SF; Latter, AJ; Riley, G; Routledge, C; Middlemiss, DN; Price, GW (2000). "Characterization of 125I-SB-258585 binding to human recombinant and native 5-HT6 receptors in rat, pig and human brain tissue". British Journal of Pharmacology. 130 (7): 1597–605. doi:10.1038/sj.bjp.0703458. PMC 1572217. PMID 10928963.
  2. ^ Roberts, JC; Reavill, C; East, SZ; Harrison, PJ; Patel, S; Routledge, C; Leslie, RA (2002). "The distribution of 5-HT(6) receptors in rat brain: an autoradiographic binding study using the radiolabelled 5-HT(6) receptor antagonist (125)ISB-258585". Brain Research. 934 (1): 49–57. doi:10.1016/S0006-8993(02)02360-0. PMID 11937069.
  3. ^ East, SZ; Burnet, PW; Leslie, RA; Roberts, JC; Harrison, PJ (2002). "5-HT6 receptor binding sites in schizophrenia and following antipsychotic drug administration: autoradiographic studies with 125ISB-258585". Synapse. 45 (3): 191–9. doi:10.1002/syn.10097. PMID 12112397.
  4. ^ Stean, TO; Hirst, WD; Thomas, DR; Price, GW; Rogers, D; Riley, G; Bromidge, SM; Serafinowska, HT; et al. (2002). "Pharmacological profile of SB-357134: a potent, selective, brain penetrant, and orally active 5-HT(6) receptor antagonist". Pharmacology Biochemistry and Behavior. 71 (4): 645–54. doi:10.1016/S0091-3057(01)00742-0. PMID 11888556.
  5. ^ Loiseau, F; Dekeyne, A; Millan, MJ (2008). "Pro-cognitive effects of 5-HT6 receptor antagonists in the social recognition procedure in rats: implication of the frontal cortex". Psychopharmacology. 196 (1): 93–104. doi:10.1007/s00213-007-0934-5. PMID 17922111.
  6. ^ Wesołowska, A; Nikiforuk, A; Stachowicz, K (2007). "Anxiolytic-like and antidepressant-like effects produced by the selective 5-HT6 receptor antagonist SB-258585 after intrahippocampal administration to rats". Behavioural Pharmacology. 18 (5–6): 439–46. doi:10.1097/FBP.0b013e3282d28f9c. PMID 17762512.