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Therapeutic interchange between the available forms of sustained release nifedipine (osmotic-pump and coat-core forms of nifedipine) is a matter of controversy. This study was initiated to determine whether there is a difference in clinical outcomes when there is interchange between the two forms of sustained release nifedipine when used for the treatment of hypertension. A total of 43 patients with a history of stage I hypertension who were receiving stable doses of the osmotic-pump form of nifedipine for &gt; 3 months with controlled blood pressures (&lt; 150/90 mm Hg) were enrolled. Patients were then switched to the same dose of the coat-core form of nifedipine and were followed for 3 months. In the 36 patients who completed the study, mean trough serum nifedipine concentrations were significantly higher with the osmotic-pump from (46.5 +/- 35.0 ng/mL) of nifedipine compared with the coat-core form (27.2 +/- 20.4 ng/mL) (P &lt; .05). However, blood pressure control as determined by the indices of 24 h ambulatory blood pressure monitoring, trough blood pressures and load blood pressures were similar between the osmotic-pump and coat-core forms of nifedipine. The coat-core form of nifedipine was discontinued in four patients for possible side effects. In this group of patients with mild hypertension, there were no clinically relevant differences in blood pressure control between the two forms of nifedipine. Some patients on the coat-core form of nifedipine may need to discontinue therapy due to intolerable side effects.

Evaluation of Two Forms of Sustained Release Nifedipine Using 24 h Ambulatory Blood Pressure Monitoring