A. Ohnishi et al., PHARMACOKINETICS AND PHARMACODYNAMICS OF INTRAVENOUS OPC-18790 IN HUMANS - A NOVEL NONGLYCOSIDIC INOTROPIC AGENT, Journal of clinical pharmacology, 34(2), 1994, pp. 176-183
OPC-18790, a nonglycosidic intropic agent, is now under clinical devel
opment for treatment of congestive heart failure. Two separate studies
(one placebo-controlled) were conducted to evaluate its pharmacokinet
ics and pharmacodynamics after intravenous administration to a total o
f 36 healthy male subjects. The drug was administered both rapidly as
a.05-,.1-,.2-, or .4-mg/kg intravenous dose, and as a 1-hour infusion
of .5, 1.0, 2.5, 5.0, 10.0, or 15.0 mu g/kg/minute. Echocardiograms (E
CHO) were evaluated before and immediately and 4 hours after the rapid
administrations. Blood pressure (BP), heart rate (HR), and QTc in the
electrocardiogram also were monitored in the rapid administration stu
dy. OPC-18790 was generally well tolerated by all subjects. Maximum pe
ak plasma concentration and area under the curve increased linearly wi
th dose in both studies. The t1/2, total body clearance of drug from p
lasma (CL), and the dose fraction excreted unchanged in the urine (fe)
were comparable and dose-independent at the doses tested in both stud
ies. The overall mean values of t1/2 alpha, t1/2 beta, CL, and fe were
.08 +/- .01 hours, 3.64 +/- .22 hours, .46 +/- .01 L/kg, and 43.5 +/-
1.0%, respectively. Echocardiograms showed that, immediately after ra
pid administration of up to .4 mg/kg, OPC-18790 increased left cardiac
function dose-proportionally (P <.05 to .01): the ejection fraction b
y 21.1% and fractional shortening by 26.5% compared with the predose v
alues, blood pressure, heart rate, and QTc did not differ between subj
ects given OPC-18790 and these receiving placebo. Intravenous OPC-1879
0 at the dose ranges used is considered to be safe and tolerable and e
xerts positive inotropic effects in a dose-proportional manner. This d
rug is potentially useful in the treatment of severe congestive heart
failure.