Abstract:
:Roxatidine acetate (HOE 760, TZU 0460) is a new H2-receptor antagonist which is more potent than cimetidine and ranitidine. A randomised, double-blind, placebo-controlled study was conducted in healthy men to determine the effects of multiple oral doses of roxatidine acetate on unstimulated gastric acid secretion, and to assess the preliminary multiple-dose pharmacokinetics of its active desacetyl metabolite. The subjects were randomised to receive either roxatidine acetate 150 mg or placebo daily at 9 pm for 14 days. Gastric secretions were collected by aspiration using a nasogastric tube placed in the distal part of the stomach. Gastric fluid volume, pH, and acid concentrations were determined for 2 hours before drug administration and over 24 hours after administration on days 1, 7, 14 (the last day of dosing), and 17 (3 days after the last dose). Plasma and urine samples were collected throughout the study for the pharmacokinetic assessment. All subjects completed the study without side effects or clinically significant changes in any of the safety variables. Subjects receiving roxatidine acetate had substantial increases in gastric pH and decreases in acid secretion compared to baseline and to placebo-treated subjects. The duration of effect was approximately 12 hours. Nocturnal pH was greater than or equal to 6.0 in 80% of the roxatidine acetate-treated subjects. When sampled 3 days after the last dose (day 17) no differences in pH, acid secretion, or gastric volume were observed between the roxatidine acetate- and placebo-treated groups. The gastric pH increased with the mean plasma concentrations of the desacetyl metabolite. Mean plasma levels at steady state were attained between the 4th and 7th days after which there was no evidence of appreciable accumulation of the desacetyl metabolite. Roxatidine acetate 150 mg administered orally at 9 pm for 14 days to healthy men was safe, well tolerated, and produced clinically relevant increases in gastric pH, and decreases in gastric acid concentration, without affecting gastric fluid volume.
journal_name
Drugsjournal_title
Drugsauthors
Lassman HB,Ho I,Puri SK,Sabo R,Scheffler MRdoi
10.2165/00003495-198800353-00011subject
Has Abstractpub_date
1988-01-01 00:00:00pages
53-64eissn
0012-6667issn
1179-1950journal_volume
35 Suppl 3pub_type
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