Pharmacokinetic evaluation of D-ribose after oral and intravenous administration to healthy rabbits

Karem H Alzoubi,1 Zuhair Bani Ismail,2 Mohamed K AL-Essa,3 Osama Y Alshogran,1 Reem F Abutayeh,4 Nareman Abu-Baker5 1Department of Clinical Pharmacy, Faculty of Pharmacy, Jordan University of Science and Technology, Irbid, Jordan; 2Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid, Jordan; 3Department of Physiology, Faculty of Medicine, University of Jordan, Amman, Jordan; 4Department of Medicinal Chemistry and Phytochemistry, Applied Science Private University, Amman, Jordan; 5Philadelphia Biomedical Products Development Center, Amman, Jordan Introduction: This study explored d-ribose pharmacokinetics after intravenous (IV) and oral administration to healthy rabbits. Materials and methods: D-ribose was administered once as 420 mg/kg (N=4) or 840 mg/kg (N=6) dose intravenously, or as an oral dose of 420 mg/kg (N=3) or 840 mg/kg (N=3). Serum was obtained at various time points, up to 210 minutes after administration. Urine was also collected after IV administration. Pharmacokinetic parameters were determined from drug concentration–time data using Kinetica software. Results: The findings showed that D-ribose follows a dose-dependent kinetic profile. With doubling the IV dose, AUCtotal was significantly increased by threefold, while the clearance was decreased by 44%. The half-life was 1.7-fold longer at the higher dose. Similar nonsignificant trends were also observed at oral administration. D-ribose was rapidly absorbed (Tmax=36–44 minutes) and rapidly disappeared from plasma (within