PF-03654764 has pKi values of 8.98 and 8.10 for human H3 and rat H3 in whole cell assay, respectively. PF-03654764 has pKi values of 8.84, 7.73 and Ki values of 1.4 nM and 19 nM for human H3 and rat H3 in HEK-293 cells, respectively. PF-03654764 has >1000-fold selectivity for the H3 receptor over the other histamine receptor subtypes.
PF-03654764 has a human liver microsomes (HLM) T1/2 of 120 min and a HLM CLh <5 mL/min•kg.