Pharmacokinetic interaction between ketoconazole and SPP301 in healthy volunteers
Dieterle, W.; Mann, J.
International Journal of Clinical Pharmacology and Therapeutics 44(7): 326-330
2006
ISSN/ISBN: 0946-1965 PMID: 16961161 Document Number: 603616
Background: SPP301 is a potent and highly selective ETA receptor blocker. The primary aim of the present study was to investigate the effect of the potent CYP3A4 inhibitor ketoconazole on the pharmacokinetics of SPP301. Methods: In a randomized, open-label 2-period oral crossover study, 12 healthy male subjects received treatments A and B. Treatment A consisted of 200 mg ketoconazole once daily on Days 1 - 4 and concomitantly 5 mg SPP301 on Day 3. Treatment B consisted of 5 mg SPP301 administered alone. Plasma concentrations of SPP301 and its hydroxymethyl metabolite were measured by LC-MS/MS. Results: Ketoconazole coadministration increased the systemic availability of SPP301 and its hydroxymethyl metabolite 3-fold and prolonged their half-lives by a factor of 2. The ratios of least square means (90% CI) of pharmacokinetic parameters in the presence and absence of ketoconazole for SPP301 and its metabolite were C a,, (maximum plasma concentration) 1.22 (1.13, 1.32) and 1.2 (1.05, 1.37), AUC((0-infinity)) (area under the plasma concentration-time curve from time zero to infinity) 3.16 (2.84, 3.51) and 3.14 (2.49, 3.70) and t(1/2) (apparent terminal half-life) 2.21 (1.55, 2.87) and 2.00 (1.17, 2.84), i.e. an increase of systemic exposure by a factor of 3.2, with individual exposures increasing up to 5.9-fold. Single oral doses of SPP301 were well tolerated when administered alone or together with multiple doses of ketoconazole. Conclusion: In the presence of potent CYP3A4 inhibitors exposure of SPP301 may be increased up to 6-fold.