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  • Title: Acute hypotensive effects of oral and intravenous propranolol: early alterations in peripheral resistance.
    Author: Fagan TC, Gourley LA, Sawyer PR, Lee JT, Walle T, Gaffney TE.
    Journal: J Clin Hypertens; 1986 Mar; 2(1):21-9. PubMed ID: 3723158.
    Abstract:
    The effects of single oral and intravenous doses of propranolol on blood pressure and hemodynamics were measured in normal volunteers. Systolic and diastolic blood pressure decreased 10% within 3 hours after the oral dose and by 3%-5% after the intravenous dose. Cardiac output decreased 16% after the intravenous dose and 10% after the oral dose. Total peripheral resistance transiently increased by 23% after the intravenous, but not after the oral dose. Change in mean arterial pressure was positively correlated with change in total peripheral resistance after both the oral and intravenous doses. In contrast, change in mean arterial pressure was negatively correlated with change in cardiac output after the intravenous dose. Single oral and intravenous doses of propranolol lowered blood pressure within 3 hours after administration, and the reduction was correlated with change in total peripheral resistance and not with change in cardiac output. At least part of the adaptation in peripheral resistance occurs within the first 3 hours after both oral and intravenous single doses of propranolol.
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