Objectives: We conducted a randomized, double-blind, placebo-controlled study to evaluate the pharmacokinetics and pharmacodynamics of landiolol hydrochloride in a dose escalation regimen in healthy male volunteers.
Methods: We set two-dose escalation regimen (LM and MH groups) using three different doses [L (low): 0.03 mg/kg/min (1 min) loading-->0.01 mg/kg/min (10 min) continuous, M (medium): 0.06 mg/kg/min (1 min) loading-->0.02 mg/kg/min (10 min) continuous, H (high): 0.125 mg/kg/min (1 min) loading-->0.04 mg/kg/min (10 min) continuous]. Sixteen subjects were allocated randomly to the LM, MH, and placebo groups (n=6, 6, and 4, respectively).
Results: In both the LM and MH groups, the blood concentration of landiolol hydrochloride changed within a constant range from 2 minutes after initiation of administration to just before the higher dose escalation. By 2 minutes following the higher dose escalation, the concentration of landiolol hydrochloride reached C(max), and reached almost steady state levels until 6 minutes following administration of the higher dose. The t(1/2) of landiolol hydrochloride was 3.5 minutes. The heart rates and blood pressures of subjects administered landiolol hydrochloride decreased, but there were no adverse events in any subject.
Conclusions: The concentration of landiolol hydrochloride rapidly reached steady state levels, and rapidly dissipated after completion of administration.