Abstract
The SAR of H3 ligands has been difficult to evaluate because of species differences, multiple isoforms and constitutive activity, among other complicating factors. A review is given of the sometimesconflicting affinity, activity and efficacy data of H3 agonists that has been described in literature to date.
Keywords: histamine, h3, gpcr, agonist, isoform, activity, efficacy, affinity