title: Bioavailability of dalarelin--a superactive GnRH analogue--in rats.
abstract: 125I-marked dalarelin (a modified analogue of GnRH) or GnRH (gonadotropin-releasing hormone) were administered to the tested rats in single doses of 127 ng/kg by subcutaneous injections. Dalarelin and GnRH were absorbed from the injected doses in 0.64 and 0.49%, respectively. Only one remarkable maximal concentration of these hormones was noticed in rats' blood 30 min after the administration. Dalarelin maximal concentration was 261.5 pg/cm3 and was 93.43% higher than the maximal concentration of GnRH. Dalarelin bioavailability was 1651.89 pg/cm3, whereas GnRH bioavailability was 718 pg/cm3 h. The bioavailability level of dalarelin was 230% compared with that for GnRH, which was accepted as a pattern of bioavailability.
authors.affiliation: Department of Applied Pharmacy and Drug Technology, Silesian Medical Academy, Sosnowiec, Poland.
authors.forename: F
authors.initials: F
authors.lastname: Ryszka
authors.forename: B
authors.initials: B
authors.lastname: Dolińska
authors.forename: A
authors.initials: A
authors.lastname: Suszka-Switek
mesh_terms: D000818:Animals; D001682:Biological Availability; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics; D051381:Rats; D017208:Rats, Wistar
chemical_list: C404725:dalarelin; D007987:Gonadotropin-Releasing Hormone