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“Intravenous administration of guanfacine (30-100 micrograms/kg) produced a decrease in both adrenal nerve activity and adrenal catecholamine secretion rate that paralleled a decrease in arterial blood pressure and heart rate.”
“This guanfacine dose produced decreases up to about 20% of the pretreatment values in both epinephrine and norepinephrine secretion rates from the adrenal medulla.”