“…Prenylamine differs in its effects from either of the two classes of blocking agents used in that it is reported to produce a reserpine-like depletion of catecholamine storage granules (Schone & Lindner, 1960;Carlsson, Hillarp & Waldeck, 1963), and was shown to exhibit both a-adrenolytic (Kochsiek, Scheler & Bretschneider, 1960;Lindner, 1963;Kuschke, Eckmann & others, 1964;Obianwu, 1967) and P-adrenolytic (Lindner, 1960(Lindner, , 1964Haas, 1964 ;Fleckenstein, Doring & others, 1968) properties. Lindner (1964) and Braunsteiner, Sailer & Sandhofer (1965) showed prenylamine to block the noradrenaline-induced mobilization of free fatty acids in dogs, and to lower free fatty acid blood levels in man. The slight elevation of cholesterol seen in our experiments after prenylamine, 25 and 50 mg/kg, as well as the failure of 25 mg/kg to block the hypercholesterolemic effect of adrenaline may reflect the sympathomimetic properties of prenylamine in discharging endogenous catecholamines.…”