[Studies of novel 1,4-dihydropyridine Ca antagonist CS-905. I. Measurement of partition coefficient (log P) by high performance liquid chromatography (HPLC)].

A new 1,4-dihydropyridine derivative, CS-905, currently under development as a Ca antagonist, showed a gradual onset and long duration in its antihypertensive effect upon single oral administration. The partition coefficient for CS-905 was measured along with 11 known dihydropyridine Ca antagonists by the HPLC method to clarify its mode of action. The log PHPLC for CS-905 was, 5.18, almost the same as that of manidipine and this value is the highest among the measured drugs. Its pharmacokinetic profile in SHR was also discussed.