PF-03654764 is an orally active, selective histamine H₃ receptor antagonist with K_i values of 1.2 nM and 7.9 nM for human H₃ and rat H₃ in whole cell assay, respectively. The combination of PF-03654764 and Fexofenadine (HY-B0801A) has the potential for allergic rhinitis research.

PF-03654764 has pK_i values of 8.98 and 8.10 for human H₃ and rat H₃ in whole cell assay, respectively. PF-03654764 has pK_i values of 8.84, 7.73 and K_i 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) T_1/2 of 120 min and a HLM CL_h <5 mL/min•kg.

西域 has not independently confirmed the accuracy of these methods. They are for reference only.

PF-03654764 (10 mL/kg; oral; 14 days) has a C_max of 8057 ng/mL and an AUC_0-24 of 67400 ng•h/mL in Sprague-Dawley rats.
PF-03654764 (1 mL/kg; oral; 7 days) has a C_max of 6302 ng/mL and an AUC_0-24 of 18175 ng•h/mL in beagle dogs.

西域 has not independently confirmed the accuracy of these methods. They are for reference only.

PF-03654764 (10 mL/kg; oral; 14 days) has a C_max of 8057 ng/mL and an AUC_0-24 of 67400 ng•h/mL in Sprague-Dawley rats.
PF-03654764 (1 mL/kg; oral; 7 days) has a C_max of 6302 ng/mL and an AUC_0-24 of 18175 ng•h/mL in beagle dogs.

西域 has not independently confirmed the accuracy of these methods. They are for reference only.

• . Travis T Wager, et al. Discovery of two clinical histamine H(3) receptor antagonists: trans-N-ethyl-3-fluoro-3-[3-fluoro-4-(pyrrolidinylmethyl)phenyl]cyclobutanecarboxamide (PF-03654746) and trans-3-fluoro-3-[3-fluoro-4-(pyrrolidin-1-ylmethyl)phenyl]-N-(2  [Content Brief]

  . Michelle L North, et al. Add-on histamine receptor-3 antagonist for allergic rhinitis: a double blind randomized crossover trial using the environmental exposure unit. Allergy Asthma Clin Immunol. 2014 Jul 3;10(1):33.  [Content Brief]