Pharmacokinetics and pharmacodynamics of captopril were studied in 5 continuous ambulatory peritoneal dialysis (CAPD) patients (including 2 hypertensive patients) after single oral administration of 50 mg captopril. The pharmacokinetic parameters for plasma free unchanged captopril were time to maximal concentration 1.1 ± 0.3 h, maximal plasma concentration 387 ± 75 ng·ml-1, elimination half-life 1.0 ± 0.3 h, and the area under the concentration-time curve 711 ± 144 ng·h•ml-1. For plasma total captopril (the sum of free unchanged captopril and its disulfide compounds) the values were time to maximal concentration 3.5 ± 0.6 h and maximal plasma concentration 2,777 ± 429 ng·ml-1. Captopril was detected in the dialysis fluid in all CAPD patients. Blood pressures in the 2 hypertensive CAPD patients were lower at 24 h after than before captopril administration. These results suggest that captopril may be eliminated by CAPD. In addition, there is a possibility that the antihypertensive effects of captopril may be prolonged in hypertensive CAPD patients.

Keywords:
Captopril, pharmacodynamics, Captopril, pharmacokinetics, Continuous ambulatory peritoneal dialysis
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© 1986 S. Karger AG, Basel
1986
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