Effect of pharmacist intervention on control of resistant hypertension.

The effect of a pharmacist's clinical intervention on blood pressure control in ambulatory adults with resistant hypertension was studied. Twenty patients of an internal medicine clinic who had diastolic blood pressures greater than 96 mm Hg on two consecutive visits and antihypertensive regimens consisting of two or more agents were entered in the study between November 1, 1980, and February 1, 1981. After asking each patient 15 questions about hypertension and its treatment, the pharmacist counseled the patient about antihypertensive therapy, obtained a medication history, and discussed diet. The patient's blood pressure was measured, and the pharmacist evaluated the appropriateness of the patient's antihypertensive regimen (based on compliance, adverse reactions, and regimen complexity) and possible reasons for the poor response to treatment. The pharmacist then recommended drug therapy to the physician; stepped care including hydrochlorothiazide, reserpine, and hydralazine was used when possible. Patients' mean age was 56 years. Most did not know the names of their medications or understand their dosage schedules. Eight patients had severe hypertension (193/124 +/- 23/4 mm Hg), five had moderate hypertension (161/109 +/- 20/2 mm Hg), and seven had mild hypertension (171/100 +/- 29/0 mm Hg). Factors contributing to poor blood pressure control were noncompliance and adverse drug effects. After five to eight months of follow-up, mean blood pressures for patients with severe, moderate, and mild hypertension were, respectively, 140/92 +/- 23/10 mm Hg, 131/92 +/- 8/6 mm Hg, and 137/88 +/- 26/3 mm Hg; the mean for each group was significantly different from baseline. In this study, pharmacists intervened successfully with patients and physicians to enhance blood pressure control through drug therapy.