Study Objectives. To evaluate trends in adverse symptoms as blood pressure becomes controlled, and to determine if these symptoms are influenced by social support and self-efficacy. Design. Secondary analysis from a randomized controlled study of physician-pharmacist collaboration to improve blood pressure control. Setting. Five university-affiliated primary care clinics. Patients. A total of 179 patients (aged 21–85 yrs) with uncontrolled primary hypertension who were taking no antihypertensive drugs or up to three antihypertensive drugs at baseline were randomized to the intervention group, in which pharmacists were involved in their care, or to the control group, who received usual care from their physicians. Of these patients, 160 completed the study: 92 were in the intervention group, and 68 were in the control group. Intervention. In both groups, patient-reported symptoms suggestive of adverse drug reactions (ADRs) were recorded at each study visit with use of a structured ADR questionnaire. Social support and self-efficacy questionnaires were also administered at each study visit. Measurements and Main Results. Patients' ADR scores decreased significantly from baseline to the end of the study in both the control (from a mean of 26.5 to 18.4) and intervention (from 29.9 to 22.7) groups (p
