Astemizole (68844-77-9) is an antagonist at the histamine H1 receptor.
1) Richards et al. (1984), Astemizole. A review of its pharmacodynamic properties and therapeutic efficacy; Drugs, 28 38
2) Laduron et al. (1982), In vitro and in vivo binding characteristics of a new long-acting histamine H1 antagonist, astemizole; Mol. Pharmacol., 21 294