title: Kinetics of rate controlled rectally administered ranitidine to male volunteers.
abstract: Ranitidine hydrochloride solution was given rectally to six healthy volunteers by means of an osmotic pump (Osmet) at a zero-order rate for 8 h. Quite constant steady-state drug concentrations were achieved in the range of 64-123 ng/ml plasma (mean Css: 100.6 ng/ml). The mean absorption time was 0.45 h (range 0-I.02 h), indicating that absorption was not always instantaneous. It is concluded that the Osmet system together with the rectal route offer the possibility for achieving steady-state concentrations of ranitidine, enabling the determination of pharmacodynamic effects. In addition, the rectal route can be considered as an alternative to oral and intravenous administration.
mesh_terms: D000285:Administration, Rectal; D000328:Adult; D001682:Biological Availability; D006801:Humans; D007700:Kinetics; D008297:Male; D009995:Osmosis; D011899:Ranitidine / Q000008:administration & dosage / Q000097:blood / Q000378:metabolism*
chemical_list: D011899:Ranitidine