Hiroshima Journal of Medical Sciences Volume 33 Issue 4
published_at 1984-12

Metabolism of an Antiallergic Agent, Azelastine (4-(p-Chlorobenzyl)-2-[N-Methylperhydroazepinyl-(4)]- 1-(2H)-Phthalazinone Hydrochloride) in Rats and Guinea Pigs

ラットおよびモルモットにおける抗アレルギー剤 azelastine の代謝
Tatsumi Kiyoshi
Yamada Hideyuki
Yoshimura Hidetoshi
Nishizawa Yukio
Sakai Misao
Mizuo Hitoshi
Yamato Chiyuki
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Abstract
The in vivo metabolism of an antiallergic agent, azelastine, (4-(p-chlorobenzyl)-2-[N-methylperhydroazepinyl-(4)]-1-(2H)-phthalazinone hydrochloride) was examined following oral administration to rats and guinea pigs. As a result, it was found that the drug was metabolized to 4-(p-chlorobenzyl)-2-[N-methyl-7-oxo-perhydroazepinyl-(4)]-1-(2H)-phthalazinone, 6-hydroxy-4-(p-chlorobenzyl)-2-[N-methylperhydroazepinyl-(4)]-1-(2H)-phthalazinone (6-hydroxyazelastine), 7-hydroxy-4-(p-chlorobenzyl)-2-[N-methyl -perhydroazepinyl-(4)]-1-(2H)-phthalazinone and 4-(p-chlorobenzyl)-2-[perhydroazepinyl-(4)]-1-(2H)-phthalazinone (desmethylazelastine) in these animal bodies. A part of the hydroxy derivatives of the drug was excreted into urine as their glucuronides. In addition, the incubation of azelastine with rat liver microsomes resulted in the formation of 6-hydroxyazelastine and desmethylazelastine in the presence of an NADPH-generating system.
Keywords
Metabolism
Azelastine