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http://dmd.aspetjournals.org/ The metabolism of roxatidine acetate hydrochloride (RA), a new histamine-2 receptor antagonist, was studied by GC/MS in rats and dogs in vivo. The co-administration of 14C-RA and RA-d10 labeled with deuterium in the piperidine ring expedited the isolation and identification of 15 urinary metabolites. The major metabolites in both animals were M-1, M-8, M-10, and M-11; M-4 could be found only in the rat. The aromatic and piperidine ring-hydroxylated metabolites were found in small amounts in both species. Following the administration of RA-d10 to rats and dogs, oxygenated metabolites on the piperidine ring, such as M-3 and M-4, were isolated and their analysis indicated the unexpected loss of three or four deuterium atoms from the ring. Also, first and second isotope effects were observed on the conversion rate in vivo and retention time in HPLC, respectively.
http://pubmedcentralcanada.ca/ It is well documented that histamine H2 receptor antagonists decrease gastric acid production by competitively inhibiting the action of histamine on the H2 receptor of gastric parietal cell. Since this drug is efficacious in decreasing gastric juices and increasing gastric pH, several investigators have noted that it would be useful for the
prophylaxis of acid aspiration pneumonia, which is one of the most severe perioperative complications. It is thought that handicapped patients' vomiting reflex is easily triggered; they may also have problems with the swallowing mechanism, and some of them suffer from silent
regurgitation. In addition, some uncooperative and noncomprehending individuals may eat or drink before anesthesia despite specific instructions about fasting. Therefore, general anesthesia for the handicapped requires careful attention to vomiting and aspiration pneumonia.
We evaluated the effect of the long-acting H2 receptor antagonist, roxatidine acetate hydrochloride, on gastric volume and gastric pH when given as an oral preanesthetic.
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