Substituted 1, 2, 3, 4-tetrahydroaminonaphthols were found to be calcium channel blockers with antihypertensive properties. These compounds also possessed adrenergic P-receptor blocking activity. From the structure-activity studies, no clear correlation emerged between the in vitro calcium channel blocking activity and the acute antihypertensive activity in cannulated spontaneously hypertensive rats. Extensive pharmacological testing of ...