This study was designed to assess the plasma disposition kinetics of single oral 4-, 6-, and 8-mg doses of lacidipine, a new once-daily calcium-entry blocker. Seventeen healthy volunteers attended the study. In almost all cases, detectable levels were found up to 24 h after the drug administration, using a new HPLC-RIA assay. The usual pharmacokinetic parameters were calculated: Cmax, tmax, AUCinf, λ, and t1/2. The half-life was similar after all doses, around 7 h. whereas Cmax and AUCinf did not show a linear correlation with the doses.