Prucalopride

Prucalopride (R093877) is a drug acting as a selective, high affinity 5-HT4 receptor agonist(pKi=8.6/8.1 for 5-HT4a/4b); >150-fold higher affinity for 5-HT4 receptors than for other receptors.IC50 value: 8.6/8.1 for 5-HT4a/4b(pKi)Target: 5-HT4 receptorPrucalopride is a novel enterokinetic compound and is the first representative of the benzofuran class. Receptor binding data have demonstrated prucalopride's high affinity to both investigated 5-HT(4) receptor isoforms, with mean pK(i) estimates of 8.60 and 8.10 for the human 5-HT(4a) and 5-HT(4b) receptor, respectively. From the 50 other binding assays investigated in this study only the human D(4) receptor (pK(i) 5.63), the mouse 5-HT(3) receptor (pK(i) 5.41) and the human sigma(1) (pK(i) 5.43) have shown measurable affinity, resulting in at least 290-fold selectivity for the 5-HT(4) receptor [1].

References:
[1]. Briejer MR, et al. The in vitro pharmacological profile of prucalopride, a novel enterokinetic compound. Eur J Pharmacol. 2001 Jun 29;423(1):71-83.
[2]. Emmanuel AV, et al. Randomised clinical trial: the efficacy of prucalopride in patients with chronic intestinal pseudo-obstruction--a double-blind, placebo-controlled, cross-over, multiple n = 1 study. Aliment Pharmacol Ther. 2012 Jan;35(1):48-55.
[3]. Bouras EP, et al. Selective stimulation of colonic transit by the benzofuran 5HT4 agonist, prucalopride, in healthy humans. Gut. 1999 May;44(5):682-6.