title: Ranitidine bioavailability and disposition kinetics in patients undergoing chronic hemodialysis.
abstract: The absorption and disposition of single-dose intravenous (i.v.) and oral ranitidine were evaluated in 6 patients undergoing chronic hemodialysis. Ranitidine was given as either 50 mg (0.16 mM) i.v. or 150 mg (0.48 mM) tablets 4 h prior to hemodialysis according to a randomized cross-over design with tests separated by 2 weeks. Following i.v. administration, the peak serum ranitidine concentration was 761 +/- 207 micrograms/l (mean +/- SD) and the observed peak after the oral dose was 833 +/- 206 micrograms/l at 3.5 +/- 1.2 h. To convert micrograms/l to microM/l, divide by 314. The terminal elimination rate constants for the i.v. and oral doses were 0.062 +/- 0.013 and 0.058 +/- 0.004 h-1, respectively, with an apparent volume of distribution of 139.6 +/- 35.3 liters and total body clearance 8.5 +/- 1.6 liters/h for the i.v. dose. Hemodialysis clearances during the i.v. and oral studies were 3.2 +/- 0.9 and 3.1 +/- 1.0 liters/h, respectively, and the mean amount removed by hemodialysis following i.v. administration was 3.9 +/- 2.7 mg. The bioavailability of ranitidine was 54.3 +/- 13.5%. Based on these single-dose data, a daily oral dose of 150 mg ranitidine in patients with end-stage renal disease should provide a mean ranitidine serum concentration of approximately 350 micrograms/l with less than 10% of body stores of ranitidine being lost during any dialysis session.
authors.affiliation: Department of Pharmacy, Medical College of Virginia, Richmond.
authors.forename: T J
authors.initials: TJ
authors.lastname: Comstock
authors.forename: D A
authors.initials: DA
authors.lastname: Sica
authors.forename: A
authors.initials: A
authors.lastname: Harford
authors.forename: F
authors.initials: F
authors.lastname: Eshelman
mesh_terms: D000328:Adult; D001682:Biological Availability; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000378:metabolism* / Q000628:therapy; D008297:Male; D011897:Random Allocation; D011899:Ranitidine / Q000008:administration & dosage / Q000493:pharmacokinetics*; D006435:Renal Dialysis
chemical_list: D011899:Ranitidine