title: Localization of [14C]amoxicillin in rat gastric tissue when administered with lansoprazole and clarithromycin.
abstract: The gastric mucosal distribution of [14C]amoxicillin when administered to rats with or without lansoprazole and clarithromycin was investigated. After oral administration, the amount found in the gastric mucosa was higher than after iv administration. Co-administration of lansoprazole and clarithromycin had no apparent effect on the distribution pattern of [14C]amoxicillin within the deeper stomach layers. About 50-60% of the radioactivity in the gastric tissue was present in the mucosal layer, irrespective of the route of administration. Microautoradiograms of the gastric mucosa indicated that [14C]amoxicillin was distributed in both the mucous layer and surface epithelial cells following oral administration. [14C]amoxicillin was secreted mainly by surface epithelial cells after iv administration, although only in small quantities.
authors.affiliation: Department of Drug Metabolism, Research Center, Taisho Pharmaceutical Co., Ltd, 403 Yoshino-cho 1-chome, Saitama-shi, Saitama 330-8530, Japan. hiromi.endou@po.rd.taisho.co.jp
authors.forename: H
authors.initials: H
authors.lastname: Endo
authors.forename: H
authors.initials: H
authors.lastname: Yoshida
authors.forename: N
authors.initials: N
authors.lastname: Ohmi
authors.forename: K
authors.initials: K
authors.lastname: Ohta
authors.forename: S
authors.initials: S
authors.lastname: Higuchi
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000658:Amoxicillin / Q000008:administration & dosage / Q000493:pharmacokinetics*; D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000493:pharmacokinetics; D002250:Carbon Radioisotopes / Q000493:pharmacokinetics; D017291:Clarithromycin / Q000008:administration & dosage / Q000493:pharmacokinetics*; D004359:Drug Therapy, Combination / Q000008:administration & dosage / Q000493:pharmacokinetics*; D005753:Gastric Mucosa / Q000187:drug effects / Q000378:metabolism*; D064747:Lansoprazole; D008297:Male; D009853:Omeprazole / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics*; D010406:Penicillins / Q000008:administration & dosage / Q000493:pharmacokinetics; D051381:Rats; D017208:Rats, Wistar
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D002250:Carbon Radioisotopes; D010406:Penicillins; D064747:Lansoprazole; D000658:Amoxicillin; D017291:Clarithromycin; D009853:Omeprazole