Pharmacokinetics and pharmacodynamics of a novel orally active angiotensin converting enzyme inhibitor (HOE 498) in healthy subjects.

The pharmacokinetics and pharmacodynamics of the angiotensin converting enzyme inhibitor HOE 498 were investigated in 10 healthy normotensive male subjects. Serum levels of the active metabolite M 1 (dicarboxylic acid) of HOE 498 were measured by HPLC up to 14 days after a single oral dose of 10 mg HOE 498. Peak serum concentration of M 1 between 5-50 ng/ml was observed 1.5-3.0 h after administration. The serum concentration-time curve of M 1 was polyphasic and exhibited a prolonged terminal phase with a half-life of approximately 110 h. Despite the long terminal half-life M 1 could not be detected in urine later than 72 h after administration. The activity of the angiotensin converting enzyme in plasma was completely suppressed for up to 12 h, and 72 h after dosing 50% inhibition of the enzyme was still observed.