Groups of 6 healthy male subjects were respectively given single oral doses of placebo, nadolol, 20, 40 or 80 mg (Corgard®, Squibb, England), or propranolol, 20 or 40 mg (Inderal®, ICI, Japan). Exercise tests using a bicycle ergometer were performed with the subjects in supine position before and at 1, 2, 4, 6, 8, 12 and 24 hours after administration.
The double products at rest and during exercise were most markedly inhibited at 2 hours after administration of either nadolol or propranolol. Subsequently, the action of propranolol rapidly diminished, whereas nadolol, at each dose level, showed significant inhibion.
The elimination half-lives of unchanged compounds in the blood were 14.0 hours for nadolol at 40 mg and 3.8 hours for propranolol at 40 mg, corresponding well with their pharmacological half-lives (17.9 hours and 7.2 hours, respectively).
Hemodynamic parameters, such as cardiac index (CI) and stroke index (SI), were most markedly inhibited at 2 hours after administration of nadolol or propranolol.
Hemodynamic parameters, such as cardiac index (CI) and stroke index (SI), were most markedly inhibited at 2 hours after administration of nadolol or propranolol.
抄録全体を表示