Robalzotan ( NAD-299, AZD-7371) is a selective antagonist at the 5-HT 1A receptor. It was shown to completely reverse the  autoreceptor-mediated inhibition of serotonin release induced by the administration of selective serotonin reuptake inhibitors like citalopram in rodent studies. It was subsequently investigated by  AstraZeneca as a potential antidepressant but like many other 5-HT 1A ligands was discontinued. Later on it was researched for other indications such as  irritable bowel syndrome but was dropped once again.
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References [ edit ]
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Arborelius L, Wallsten C, Ahlenius S, Svensson TH (1999). "The 5-HT(1A) receptor antagonist robalzotan completely reverses citalopram-induced inhibition of serotonergic cell firing". Eur J Pharmacol. 382 (2): 133–138. doi: 10.1016/S0014-2999(99)00592-0. PMID 10528148.
Mucke HA. (2000). "Robalzotan AstraZeneca". Curr Opin Investig Drugs. 1 (2): 236–240. PMID 11249580.
Drossman DA, Danilewitz M, Naesdal J, Hwang C, Adler J, Silberg DG (October 2008). "Randomized, double-blind, placebo-controlled trial of the 5-HT1A receptor antagonist AZD7371 tartrate monohydrate (robalzotan tartrate monohydrate) in patients with irritable bowel syndrome". The American Journal of Gastroenterology. 103 (10): 2562–9. doi: 10.1111/j.1572-0241.2008.02115.x. PMID 18775020.