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'''RS-102221''' is a drug developed by ], which was one of the first compounds discovered that acts as a potent and selective ] at the ] ] ], with around 100x selectivity over the closely related ] and ] receptors.<ref>{{cite journal | vauthors = Bonhaus DW, Weinhardt KK, Taylor M, DeSouza A, McNeeley PM, Szczepanski K, Fontana DJ, Trinh J, Rocha CL, Dawson MW, Flippin LA, Eglen RM | display-authors = 6 | title = RS-102221: a novel high affinity and selective, 5-HT2C receptor antagonist | journal = Neuropharmacology | volume = 36 | issue = 4–5 | pages = 621–9 | pmid = 9225287 | doi = 10.1016/s0028-3908(97)00049-x | year = 1997 | s2cid = 24930608 }}</ref> It has ] effects in animal studies,<ref>{{cite journal | vauthors = Kuznetsova EG, Amstislavskaya TG, Shefer EA, Popova NK | title = Effect of 5-HT2C receptor antagonist RS 102221 on mouse behavior | journal = Bulletin of Experimental Biology and Medicine | volume = 142 | issue = 1 | pages = 76–9 | date = July 2006 | pmid = 17369908 | doi = 10.1007/s10517-006-0296-8 | s2cid = 36424571 }}</ref> increases the effectiveness of ] antidepressants,<ref>{{cite journal | vauthors = Cremers TI, Giorgetti M, Bosker FJ, Hogg S, Arnt J, Mørk A, Honig G, Bøgesø KP, Westerink BH, den Boer H, Wikstrom HV, Tecott LH | display-authors = 6 | title = Inactivation of 5-HT(2C) receptors potentiates consequences of serotonin reuptake blockade | journal = Neuropsychopharmacology | volume = 29 | issue = 10 | pages = 1782–9 | date = October 2004 | pmid = 15138437 | doi = 10.1038/sj.npp.1300474 | doi-access = free }}</ref> and shows a complex interaction with ], increasing some effects but decreasing others, reflecting a role for the 5-HT<sub>2C</sub> receptor in regulation of the ] signalling system in the brain.<ref>{{cite journal | vauthors = Filip M, Cunningham KA | title = Serotonin 5-HT(2C) receptors in nucleus accumbens regulate expression of the hyperlocomotive and discriminative stimulus effects of cocaine | journal = Pharmacology, Biochemistry, and Behavior | volume = 71 | issue = 4 | pages = 745–56 | date = April 2002 | pmid = 11888566 | doi = 10.1016/s0091-3057(01)00741-9 | s2cid = 292398 }}</ref><ref>{{cite journal | vauthors = Filip M, Cunningham KA | title = Hyperlocomotive and discriminative stimulus effects of cocaine are under the control of serotonin(2C) (5-HT(2C)) receptors in rat prefrontal cortex | journal = The Journal of Pharmacology and Experimental Therapeutics | volume = 306 | issue = 2 | pages = 734–43 | date = August 2003 | pmid = 12721337 | doi = 10.1124/jpet.102.045716 | s2cid = 8338748 }}</ref><ref>{{cite journal | vauthors = Morita K, Hamamoto M, Arai S, Kitayama S, Irifune M, Kawahara M, Kihira K, Dohi T | display-authors = 6 | title = Inhibition of serotonin transporters by cocaine and meprylcaine through 5-TH2C receptor stimulation facilitates their seizure activities | journal = Brain Research | volume = 1057 | issue = 1–2 | pages = 153–60 | date = September 2005 | pmid = 16125150 | doi = 10.1016/j.brainres.2005.07.049 | s2cid = 30437231 | url = http://ir.lib.hiroshima-u.ac.jp/files/public/0/115/20141016115526561231/Brain-Res_1057-1-2_153-160_2005-9-28.pdf }}</ref><ref>{{cite journal | vauthors = Dremencov E, Weizmann Y, Kinor N, Gispan-Herman I, Yadid G | title = Modulation of dopamine transmission by 5HT2C and 5HT3 receptors: a role in the antidepressant response | journal = Current Drug Targets | volume = 7 | issue = 2 | pages = 165–75 | date = February 2006 | pmid = 16475958 | doi = 10.2174/138945006775515491 }}</ref> |
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'''RS-102221''' is a drug developed by ], which was one of the first compounds discovered that acts as a potent and selective ] at the ] ] ], with around 100× selectivity over the closely related ] and ] receptors.<ref>{{cite journal | vauthors = Bonhaus DW, Weinhardt KK, Taylor M, DeSouza A, McNeeley PM, Szczepanski K, Fontana DJ, Trinh J, Rocha CL, Dawson MW, Flippin LA, Eglen RM | display-authors = 6 | title = RS-102221: a novel high affinity and selective, 5-HT2C receptor antagonist | journal = Neuropharmacology | volume = 36 | issue = 4–5 | pages = 621–9 | pmid = 9225287 | doi = 10.1016/s0028-3908(97)00049-x | year = 1997 | s2cid = 24930608 }}</ref> It has ] effects in animal studies,<ref>{{cite journal | vauthors = Kuznetsova EG, Amstislavskaya TG, Shefer EA, Popova NK | title = Effect of 5-HT2C receptor antagonist RS 102221 on mouse behavior | journal = Bulletin of Experimental Biology and Medicine | volume = 142 | issue = 1 | pages = 76–9 | date = July 2006 | pmid = 17369908 | doi = 10.1007/s10517-006-0296-8 | s2cid = 36424571 }}</ref> increases the effectiveness of ] antidepressants,<ref>{{cite journal | vauthors = Cremers TI, Giorgetti M, Bosker FJ, Hogg S, Arnt J, Mørk A, Honig G, Bøgesø KP, Westerink BH, den Boer H, Wikstrom HV, Tecott LH | display-authors = 6 | title = Inactivation of 5-HT(2C) receptors potentiates consequences of serotonin reuptake blockade | journal = Neuropsychopharmacology | volume = 29 | issue = 10 | pages = 1782–9 | date = October 2004 | pmid = 15138437 | doi = 10.1038/sj.npp.1300474 | doi-access = free }}</ref> and shows a complex interaction with ], increasing some effects but decreasing others, reflecting a role for the 5-HT<sub>2C</sub> receptor in regulation of the ] signalling system in the brain.<ref>{{cite journal | vauthors = Filip M, Cunningham KA | title = Serotonin 5-HT(2C) receptors in nucleus accumbens regulate expression of the hyperlocomotive and discriminative stimulus effects of cocaine | journal = Pharmacology, Biochemistry, and Behavior | volume = 71 | issue = 4 | pages = 745–56 | date = April 2002 | pmid = 11888566 | doi = 10.1016/s0091-3057(01)00741-9 | s2cid = 292398 }}</ref><ref>{{cite journal | vauthors = Filip M, Cunningham KA | title = Hyperlocomotive and discriminative stimulus effects of cocaine are under the control of serotonin(2C) (5-HT(2C)) receptors in rat prefrontal cortex | journal = The Journal of Pharmacology and Experimental Therapeutics | volume = 306 | issue = 2 | pages = 734–43 | date = August 2003 | pmid = 12721337 | doi = 10.1124/jpet.102.045716 | s2cid = 8338748 }}</ref><ref>{{cite journal | vauthors = Morita K, Hamamoto M, Arai S, Kitayama S, Irifune M, Kawahara M, Kihira K, Dohi T | display-authors = 6 | title = Inhibition of serotonin transporters by cocaine and meprylcaine through 5-TH2C receptor stimulation facilitates their seizure activities | journal = Brain Research | volume = 1057 | issue = 1–2 | pages = 153–60 | date = September 2005 | pmid = 16125150 | doi = 10.1016/j.brainres.2005.07.049 | s2cid = 30437231 | url = http://ir.lib.hiroshima-u.ac.jp/files/public/0/115/20141016115526561231/Brain-Res_1057-1-2_153-160_2005-9-28.pdf }}</ref><ref>{{cite journal | vauthors = Dremencov E, Weizmann Y, Kinor N, Gispan-Herman I, Yadid G | title = Modulation of dopamine transmission by 5HT2C and 5HT3 receptors: a role in the antidepressant response | journal = Current Drug Targets | volume = 7 | issue = 2 | pages = 165–75 | date = February 2006 | pmid = 16475958 | doi = 10.2174/138945006775515491 }}</ref> |